2,2-Bis(hydroxymethyl)butyric acid(DMBA) - ≥98% , CAS No.10097-02-6

CAS: 10097-02-6 Cat. No.: B115196 Molecular Weight: 148.16 EC Number: 424-090-1
AVAILABLE TO ORDER
GRADE & PURITY ≥98%
Synonyms
2,2-bis-(Hydroxymethyl)-n-buty | JVYDLYGCSIHCMR-UHFFFAOYSA-N | 2,2-bis(hydroxymethyl)-n-butyric acid | EC 424-090-1 | D71068 | AM90355 | A800306 | dimethylolbutanoic acid | DTXSID8064939 | 2,2'-Bis(hydroxymethyl)butyric acid | 2,2-Bis(hydroxymethyl)butyri
Storage
Room temperature
Shipped In
Normal
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Size
Status
Price
Qty
25g
B115196-25g
4
$9.90
100g
B115196-100g
4
$17.90
500g
B115196-500g
3
$48.90
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Why this grade

≥98% for sensitive chromatographic and analytical workflows requiring minimal baseline interference.

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Storage & shipping

Room temperature Ships Normal Check lot-specific COA for exact specifications.

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Quality documents

SDS, COA, datasheet, and spec sheet available for download. Lot-specific COA accessible via lot number lookup.

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Literature proof

Cited in 45 peer-reviewed publications across chromatography, organic synthesis, and cross-coupling reactions.

Specifications

Synonyms
2, 2-bis-(Hydroxymethyl)-n-buty | JVYDLYGCSIHCMR-UHFFFAOYSA-N | 2, 2-bis(hydroxymethyl)-n-butyric acid | EC 424-090-1 | D71068 | AM90355 | A800306 | dimethylolbutanoic acid | DTXSID8064939 | 2, 2'-Bis(hydroxymethyl)butyric acid | 2, 2-Bis(hydroxymethyl)butyri
Specifications & Purity
≥98%
Storage
Room temperature
Shipped In
Normal
Purity
≥98%
Names and Identifiers
Pubchem Sid488194353
Pubchem Sid Urlhttps://pubchem.ncbi.nlm.nih.gov/substance/488194353
Canonical SmilesCCC(CO)(CO)C(=O)O
IUPAC Name2,2-bis(hydroxymethyl)butanoic acid
InChIKeyJVYDLYGCSIHCMR-UHFFFAOYSA-N
INCHI1S/C6H12O4/c1-2-6(3-7,4-8)5(9)10/h7-8H,2-4H2,1H3,(H,9,10)
Isomeric SMILES CCC(CO)(CO)C(=O)O
WGK Germany 1
Molecular Weight 148.16
Reaxy-Rn 1905583
Reaxys-RN_link_address https://www.reaxys.com/reaxys/secured/hopinto.do?context=S&query=IDE.XRN=1905583&ln=

Documentation

📋 Safety Data Sheet (SDS)

Comprehensive hazard, handling, storage, and regulatory compliance document.

Download SDS →

✅ Certificate of Analysis (COA)

Lot-specific quality data. Enter your lot number to retrieve the exact COA.

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📊 Datasheet

Quick-reference summary of product specifications and applications.

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🔬 Specification Sheet

Full quality attributes and acceptance criteria for this grade.

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Advanced Data

Taxonomic Classification

Taxonomy Tree

KingdomOrganic compounds
SuperclassLipids and lipid-like molecules
ClassFatty Acyls
SubclassFatty acids and conjugates
Intermediate Tree Nodes Not available
Direct ParentHydroxy fatty acids
Alternative Parents Branched fatty acids  Beta hydroxy acids and derivatives  Monocarboxylic acids and derivatives  Carboxylic acids  Primary alcohols  Organic oxides  Hydrocarbon derivatives  Carbonyl compounds  
Molecular FrameworkAliphatic acyclic compounds
Substituents Hydroxy fatty acid - Branched fatty acid - Beta-hydroxy acid - Hydroxy acid - Monocarboxylic acid or derivatives - Carboxylic acid - Carboxylic acid derivative - Organic oxygen compound - Organic oxide - Hydrocarbon derivative - Primary alcohol - Organooxygen compound - Carbonyl group - Alcohol - Aliphatic acyclic compound
DescriptionThis compound belongs to the class of organic compounds known as hydroxy fatty acids. These are fatty acids in which the chain bears a hydroxyl group.
External Descriptors Not available
3D Structure
Interactive Chemical Structure Model





Certificates(CoA,COO,BSE/TSE and Analysis Chart)
C of A & Other Certificates(BSE/TSE, COO):
Analytical Chart:

Find and download the COA for your product by matching the lot number on the packaging.

19 results found

Lot NumberCertificate TypeDateItem
L2524203Certificate of AnalysisDec 11, 2025 B115196
L2524202Certificate of AnalysisDec 11, 2025 B115196
L2524195Certificate of AnalysisDec 11, 2025 B115196
L2524194Certificate of AnalysisDec 11, 2025 B115196
A2213219Certificate of AnalysisOct 13, 2025 B115196
A2213206Certificate of AnalysisOct 13, 2025 B115196
D2524158Certificate of AnalysisMar 10, 2025 B115196
D2524159Certificate of AnalysisMar 10, 2025 B115196
D2524160Certificate of AnalysisMar 10, 2025 B115196
D2524161Certificate of AnalysisMar 10, 2025 B115196
L2510074Certificate of AnalysisMar 10, 2025 B115196
G2418151Certificate of AnalysisApr 28, 2024 B115196
G2418152Certificate of AnalysisApr 28, 2024 B115196
G2430026Certificate of AnalysisApr 28, 2024 B115196
I2403053Certificate of AnalysisDec 21, 2021 B115196
L2418128Certificate of AnalysisDec 21, 2021 B115196
D2403031Certificate of AnalysisDec 21, 2021 B115196
B2306877Certificate of AnalysisDec 21, 2021 B115196
B2306872Certificate of AnalysisDec 21, 2021 B115196

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Chemical and Physical Properties
SolubilitySolubility in Methanol very faint turbidity
Melt Point(°C)109-112°C
Molecular Weight148.160 g/mol
XLogP3-0.900
Hydrogen Bond Donor Count3
Hydrogen Bond Acceptor Count4
Rotatable Bond Count4
Exact Mass148.074 Da
Monoisotopic Mass148.074 Da
Topological Polar Surface Area77.800 Ų
Heavy Atom Count10
Formal Charge0
Complexity117.000
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
The total count of all stereochemical bonds0
Covalently-Bonded Unit Count1
Documents & Articles
Citations of This Product
References
1. Xinjie Zhou, Yanqing Wang, Guoqing Wang, Pengcheng Li, Hongzhe Zhao, Yuetao Liu, Chuanhui Gao.  (2023)  Oxidative crosslinking induced self-reinforcing waterborne polyurethane with tunable structure as multi-synergistic antibacterial biomimetic composite coating.  COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,      [PMID:] [10.1016/j.colsurfa.2023.133054]
2. Wang Lin, Wang Xuebin, Liu Tong, Sun Fuyao, Li Suning, Geng Yuhao, Yao BoWen, Xu Jianhua, Fu JiaJun.  (2023)  Bio-inspired self-healing and anti-corrosion waterborne polyurethane coatings based on highly oriented graphene oxide.  npj Materials Degradation,  (1): (1-15).  [PMID:] [10.1038/s41529-023-00415-9]
3. Jiawei Li, Chengyu Hong, Mengsong Liu, Yongquan Wang, Yutong Song, Ruixue Zhai, Jiaqi Zhang, Chao Zhou.  (2023)  Construction of eco-friendly multifunctional cashew nut shell oil-based waterborne polyurethane network with UV resistance, corrosion resistance, mechanical strength, and transparency.  PROGRESS IN ORGANIC COATINGS,      [PMID:] [10.1016/j.porgcoat.2023.108051]
4. Kang Chen, Haoxin Zhu, Zhiyi Zhang, Yingqing Shao, Qianhui Yu, Xinlei Cao, Siyan Pan, Xin Mu, Zhenhua Gao, Di Wang, Shuangying Wei, Shuaiyuan Han.  (2023)  Self-healing polyurethane coatings based on dynamic chemical bond synergy under conditions of photothermal response.  CHEMICAL ENGINEERING JOURNAL,      [PMID:] [10.1016/j.cej.2023.145811]
5. Yuan Feng, Kecen Xiao, Jinlin Chen, Jingjing Lin, Yuanyuan He, Xueling He, Fuyi Cheng, Zhen Li, Jiehua Li, Feng Luo, Hong Tan, Qiang Fu.  (2023)  Immune-microenvironment modulatory polyurethane-hyaluronic acid hybrid hydrogel scaffolds for diabetic wound treatment.  CARBOHYDRATE POLYMERS,      [PMID:37659799] [10.1016/j.carbpol.2023.121238]
6. Yao Aisong, Li Heng, Luo Haihang, Zhao Jianming, Xiang Jun, Chen Yi, Fan Haojun.  (2023)  A novel strategy for preparation of solvent-free high-solid content water-based polyurethane.  JOURNAL OF POLYMER RESEARCH,  30  (7): (1-10).  [PMID:] [10.1007/s10965-023-03628-3]
7. Linsheng Wang, Xiang Lin, Jiajia Li, Hongyu Yang, Xiaming Feng, Chaojun Wan.  (2023)  Konjac Glucomannan Aerogels Modified by Hydrophilic Isocyanate and Expandable Graphite with Excellent Hydrolysis Resistance, Mechanical Strength, and Flame Retardancy.  BIOMACROMOLECULES,      [PMID:37141322] [10.1021/acs.biomac.3c00230]
8. Yuehong Zhang, Zhenqiang Wu, Lei Shi, Langlang Dai, Ruijing Liu, Lei Zhang, Bin Lyu, Shunhua Zhao, Vijay Kumar Thakur.  (2023)  From Castor Oil-Based Multifunctional Polyols to Waterborne Polyurethanes: Synthesis and Properties.  MACROMOLECULAR MATERIALS AND ENGINEERING,  308  (6): (2200662).  [PMID:] [10.1002/mame.202200662]
9. Jing Wang, Jihu Wang, Song Wang, Shaoguo Wen, Kaimin Chen, Chen Xie, Chunping Yuan.  (2022)  Study on the Synthesis and Properties of Waterborne Polyurea Modified by Epoxy Resin.  Polymers,  14  (11): (2283).  [PMID:35683955] [10.3390/polym14112283]
10. Lianmin Chen, Mingyu Guo.  (2021)  Highly Transparent, Stretchable, and Conductive Supramolecular Ionogels Integrated with Three-Dimensional Printable, Adhesive, Healable, and Recyclable Character.  ACS Applied Materials & Interfaces,      [PMID:34003634] [10.1021/acsami.1c04255]
11. Liu Wei, Yao Tingting, Jia Kun, Gu Jianyu, Wang Donghong, Wei Xuehong.  (2021)  Flexible and thermal conducting multi-walled carbon nanotubes/waterborne polyurethane composite film from in situ polymerization for efficient electromagnetic interference shielding.  JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS,  32  (4): (4393-4403).  [PMID:] [10.1007/s10854-020-05182-w]
12. Zhao Long-Mei, Gong Mei, Wang Rui, Yuan Qi-Juan, Zhang Yi, Pi Jin-Kui, Lv Xiu-He, Xie Yan, Xie Hui-Qi.  (2021)  Accelerating ESD-induced gastric ulcer healing using a pH-responsive polyurethane/small intestinal submucosa hydrogel delivered by endoscopic catheter.  Regenerative Biomaterials,  (1):   [PMID:33732501] [10.1093/rb/rbaa056]
13. Gang Chen, Si Ouyang, Yiqing Deng, Mengxiao Chen, Yanqing Zhao, Wangcai Zou, Qiang Zhao.  (2019)  Improvement of self-cleaning waterborne polyurethane-acrylate with cationic TiO2/reduced graphene oxide.  RSC Advances,  (32): (18652-18662).  [PMID:35515236] [10.1039/C9RA03250A]
14. Yong Qiwen, Liao Bing, Ying Guo, Caizhen Liang, Huang Hao, Pang Hao.  (2018)  Structure and surface properties of a novel bulk-matte waterborne polyurethane coating composite.  Journal of Coatings Technology and Research,  15  (5): (993-1002).  [PMID:] [10.1007/s11998-017-0030-7]
15. Zhiyuan He, Liuchun Zheng, Zhenqi Liu, Shenglin Jin, Chuncheng Li, Jianjun Wang.  (2017)  Inhibition of Heterogeneous Ice Nucleation by Bioinspired Coatings of Polyampholytes.  ACS Applied Materials & Interfaces,      [PMID:28812348] [10.1021/acsami.7b10014]
16. Jianquan Tan, Weiqu Liu, Zhengfang Wang.  (2016)  Preparation and performance of waterborne UV-curable polyurethane containing long fluorinated side chains.  JOURNAL OF APPLIED POLYMER SCIENCE,  134  (8):   [PMID:] [10.1002/app.44506]
17. Siyu Chen, Longhai Guo, Dianxin Du, Jianling Rui, Teng Qiu, Jun Ye, Xiaoyu Li.  (2016)  Waterborne POSS-silane-urethane hybrid polymer and the fluorinated films.  POLYMER,      [PMID:] [10.1016/j.polymer.2016.09.034]
18. Fang Zizheng, Mu Hongfeng, Sun Zhuo, Zhang Kaihang, Zhang Anyang, Chen Jiada, Zheng Ning, Zhao Qian, Yang Xuxu, Liu Feng, Wu Jingjun, Xie Tao.  (2024)  3D printable elastomers with exceptional strength and toughness.  NATURE,  631  (8022): (783-788).  [PMID:38961297] [10.1038/s41586-024-07588-6]
19. Pengyun Tan, Xiaotong Zhao, Zengshuai Zhang, Wuji Wei, Jiahao Zhou, Yingqing Shao, Xiaojing Ma, Shuangying Wei, Zhenhua Gao, Shuaiyuan Han.  (2024)  A Highly Effective Self-Healing Waterborne Polyurethane Vitrimer Containing Conjugated Schiff Base Bonds Driven by Photothermal.  ACS Applied Polymer Materials,      [PMID:] [10.1021/acsapm.4c01274]
20. Kai Yan, Jun Wang, Yan Zong, Qunna Xu.  (2024)  A multifunctional coating toward wearable superhydrophobic fabric sensor with self-healing and flame-retardant properties with high fire alarm response.  CHEMICAL ENGINEERING JOURNAL,      [PMID:] [10.1016/j.cej.2024.151315]
21. Jun Wang, Kai Yan, Chenglong Mu, Qunna Xu, Zejian Yang, Can Zhou, Lin Yang.  (2024)  Flexible Wound Patches Based on MXene/Quercetin-Waterborne Polyurethane Composites.  ACS Applied Nano Materials,      [PMID:] [10.1021/acsanm.4c03034]
22. Jun Wang, Kai Yan, Xiao Li, Yan Zong, Qunna Xu, Xiaodan Sun.  (2024)  Hollow Polyaniline Microspheres Decorated Fabric Sensor with Electromagnetic Wave-Absorbing and Multimodal Sensing Toward Human–Machine Interaction.  ADVANCED FUNCTIONAL MATERIALS,      [PMID:] [10.1002/adfm.202418071]
23. Haibin Niu, Li Liu, Yanmei Zhu, Chao Zhou, Guangfeng Wu.  (2024)  Liquid metal-enhanced self-healing dual-hard-phase cross-linked waterborne polyurethane for flexible sensors.  EUROPEAN POLYMER JOURNAL,      [PMID:] [10.1016/j.eurpolymj.2024.113185]
24. Jiawei Li, Chengyu Hong, Jiaqi Zhang, Ruixue Zhai, Ye Han, Mengsong Liu, Yongquan Wang, Yutong Song, Chao Zhou.  (2024)  Novel multifunctional highly crosslinked bio-based waterborne polyurethane networks modified via long fatty hydrophobic side chains.  PROGRESS IN ORGANIC COATINGS,      [PMID:] [10.1016/j.porgcoat.2024.108340]
25. Xiaoxuan Li, Zheng Yin, Yanru Zhao, Penghui Li, Shengli Wu.  (2024)  Preparation of organosilicon and organofluorine synergistically modified amphiphilic branched polyurethanes and their application in diisocyanate emulsifiers.  JOURNAL OF APPLIED POLYMER SCIENCE,  141  (31): (e55723).  [PMID:] [10.1002/app.55723]
26. Zelin Liu, Xinjie Zhou, Zongsheng Wu, Chuanhui Gao, Yuetao Liu, Yanqing Wang, Luyang Sun, Li Ding.  (2024)  Preparation of waterborne polyurethane coatings with enhanced mechanical properties and superhydrophobic surface.  MATERIALS CHEMISTRY AND PHYSICS,      [PMID:] [10.1016/j.matchemphys.2024.130235]
27. Jiawei Li, Hao Zhang, Chengyu Hong, Mengsong Liu, Yongquan Wang, Ye Han, Yutong Song, Chao Zhou.  (2024)  Realization of customizable performance castor oil-based waterborne polyurethane antiseptic coatings via arbutin.  INDUSTRIAL CROPS AND PRODUCTS,      [PMID:] [10.1016/j.indcrop.2024.118315]
28. Xiaocheng Wang, Yudong Sun, Shufen Zhang, Wenbin Niu.  (2024)  Robust Biomimetic Mechanochromic Photonic Ionogel for Pressure Sensing.  ACS Applied Nano Materials,      [PMID:] [10.1021/acsanm.4c01790]
29. Jiawei Li, Chengyu Hong, Hao Zhang, Jiaqi Zhang, Ruixue Zhai, Bin Fei, Chao Zhou.  (2024)  Sustainable, transparent, strong toughness, UV resistance, and anti-corrosion properties of cashew shell oil-based waterborne polyurethane network derived from phloretin and sorbitan monooleate-based siloxane.  CHEMICAL ENGINEERING JOURNAL,      [PMID:] [10.1016/j.cej.2024.151506]
30. Yuehong Zhang, Ruijing Liu, Zhenqiang Wu, Bin Lyu, Leipeng Liu.  (2024)  Vanillin-Based Polyol Combined with Castor Oil to Fabricate Water-Borne Polyurethane with Recyclability and Self-Healing Properties for Fluorescent Ink and Flexible Sensor Applications.  ACS Sustainable Chemistry & Engineering,      [PMID:] [10.1021/acssuschemeng.4c05777]
31. He Gan, Lin Wang, Ran Sun, Junchen Li, Zhirong Zhao, Yuan Chen, Weiliang Tian, Fan Yang, Qian Huang.  (2025)  Development of a Graphene Oxide-Enhanced Thermoresponsive Self-Healing Waterborne Polyurethane Elastomer for Abdominal Wall Defect Repair.  ACS Applied Nano Materials,      [PMID:] [10.1021/acsanm.5c03159]
32. Ye Li, Guowen Zhou, Lei Wang, Yunfeng Zhou, Zepeng Lei, Xiaohui Wang.  (2025)  A Biomass-Derived Imine-Linked Waterborne Polyurethane for Self-Healable Anticorrosive Coating.  ACS Applied Polymer Materials,      [PMID:] [10.1021/acsapm.5c02428]
33. Hui Xiong, Jingxue Yan, Jun Zhang, Yuhang Jiang, Xiaoqin Chi, Hongyu Lin, Jinhao Gao.  (2025)  Cinnamaldehyde-Containing Organoarsenic Prodrug with Synergistic Anticancer Activity via Redox Dyshomeostasis.  MOLECULAR PHARMACEUTICS,      [PMID:40948450] [10.1021/acs.molpharmaceut.5c00778]
34. Yangjiao Han, Kaixin Xi, Chengshu Zhang, Wenpin Wang, Zhibo Li.  (2025)  Tough silicone-based elastomers enhanced by synergistic Zn(II)–carboxylate interactions and weak hydrogen bonds between incompatible soft segments.  Journal of Materials Chemistry A,      [PMID:] [10.1039/D5TA01214G]
35. Jian He, Zihao Qian, Zhijun Hu, Mingyu Guo.  (2025)  Transparent and Extremely Stretchable Piezoelectric Device for Sensors and Energy Harvesters.  ACS Applied Materials & Interfaces,      [PMID:40375384] [10.1021/acsami.5c05660]
36. Ruotong Du, Guowen Zhou, Xiaohui Wang.  (2025)  Vanillin Oxime-Enabled Castor-Oil-Based Waterborne Polyurethane with Tunable Mechanical, Self-Healing, and Fluorescent Properties.  MACROMOLECULAR CHEMISTRY AND PHYSICS,  226  (9): (2400493).  [PMID:] [10.1002/macp.202400493]
37. Shimin Geng, Yongtao Hu, Xinwen Hong, Tingting Chen, Mingen Fei, Shuyi Wu, Renhui Qiu, Wendi Liu.  (2025)  Palm oil-based waterborne polyurethanes: Achieving high-solid and low-viscosity through bimodal particle design.  CHEMICAL ENGINEERING JOURNAL,      [PMID:] [10.1016/j.cej.2025.165490]
38. Tianhui Zhang, Chao Yang, Hao Wang, Xinyang Li, Yi Huang, Jianzhong Shao.  (2025)  Bio-based Polycarbonate-type Waterborne Polyurethane with High Wear and Scratch Resistance: Encapsulation Application for Structural Coloration Textiles.  COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,      [PMID:] [10.1016/j.colsurfa.2025.138896]
39. Zihao Qian, Zhijun Hu, Mingyu Guo.  (2025)  Transparent and stretchable piezoelectric sensor based on molecular ferroelectric hybrid polyurethane urea elastomer†.  SENSORS AND ACTUATORS A-PHYSICAL,      [PMID:] [10.1016/j.sna.2025.117362]
40. Ruwei Guo, Mingyu Guo.  (2025)  Direct Wrinkling of Silver Nanowire Networks on Electrospun Polyurethane–Urea Mats for Stretchable Electronics.  JOURNAL OF APPLIED POLYMER SCIENCE,      [PMID:] [10.1002/app.70021]
41. Xin Song, Chunfeng Li, Lei Le, Ruiwen Yu, Mingli Liu.  (2025)  Molecular Engineering of Hybrid Functional Waterborne Polyurethane Coatings: Synergistic Effects on Interfacial Enhancement of Carbon Fibers.  ACS Applied Materials & Interfaces,      [PMID:41450134] [10.1021/acsami.5c15890]
42. Xu Jie, Wan Hong, Fang Zizheng, Peng Xinyang, Sun Jinteng, Liang Jing, Wang Xinxin, Lan Changming, Wu Ming-Bang, Zheng Ning, Liu Junqiu, Wu Baiheng.  (2026)  Continuous fabrication of Janus liquid crystal elastomer fibers with programmable actuation.  Nature Communications,      [PMID:41629322] [10.1038/s41467-026-68992-2]
43. Zongshu Li, Hanzhe Zhao, Shunuo Liu, Yaodong Wang, Kecheng Liu, Hao Wu, Boxiao Li, Ao Wang, Yunxiao Liu, Gang Wei, Lijuan Zhou, Jianming Zhang.  (2026)  Unraveling the mechanism of one-step synthesis of low-viscosity, high-solid-content waterborne polyurethanes: How sulfonate groups dictate hydration and flow.  PROGRESS IN ORGANIC COATINGS,      [PMID:] [10.1016/j.porgcoat.2026.110058]
44. Xiaohua Gu, Jiatong Chen, Xingguo Han, Jiahao Xu, Shaochun Sun, Derui Du, Yan Liu, Chenglei Wang.  (2026)  Fluorinated diol-mediated alcoholysis of waste polyurethane for high-performance recycled fluorinated polyurethane foam.  Journal of Environmental Chemical Engineering,  14  (2): (122105).  [PMID:] [10.1016/j.jece.2026.122105]
45. Ningyi Xian, Ziwei Wang, Bingqing Wang, Xiaofei Wang, Yan Zheng.  (2026)  PLOD2 Promotes Cutaneous Squamous Cell Carcinoma Progression in Association With STAT3-Related ERK and AKT Pathways.  MOLECULAR CARCINOGENESIS,      [PMID:] [10.1002/mc.70102]
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