3-(Amidinothio)-1-propanesulfonic acid - ≥97% , CAS No.21668-81-5

CAS: 21668-81-5 Cat. No.: A121968 Molecular Weight: 198.26 EC Number: 244-520-8
AVAILABLE TO ORDER
GRADE & PURITY ≥97%
Synonyms
1-Propanesulfonic acid, 3-[(aminoiminomethyl)thio]- | AS-15156 | AKOS015897506 | 3-(Amidinothio)-1-propanesulfonic acid | 3-(Carbamimidoylthio)propane-1-sulfonicacid | UPS(OiAoea+/-u>>CEaAUNI) | 1-Propanesulfonic acid, 3-((aminoiminomethyl)thio)- | 3-(car
Storage
Room temperature
Shipped In
Normal
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Size
Status
Price
Qty
5g
A121968-5g
3
$10.90
25g
A121968-25g
3

$13.90

$20.90
Save $7.00 (33.49%)
100g
A121968-100g
3
$39.90
500g
A121968-500g
1
$139.90
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Why this grade

≥97% 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 16 peer-reviewed publications across chromatography, organic synthesis, and cross-coupling reactions.

Specifications

Synonyms
1-Propanesulfonic acid, 3-[(aminoiminomethyl)thio]- | AS-15156 | AKOS015897506 | 3-(Amidinothio)-1-propanesulfonic acid | 3-(Carbamimidoylthio)propane-1-sulfonicacid | UPS(OiAoea+/-u>>CEaAUNI) | 1-Propanesulfonic acid, 3-((aminoiminomethyl)thio)- | 3-(car
Specifications & Purity
≥97%
Storage
Room temperature
Shipped In
Normal
Purity
≥97%
Names and Identifiers
Pubchem Sid504755970
Pubchem Sid Urlhttps://pubchem.ncbi.nlm.nih.gov/substance/504755970
Canonical SmilesC(CSC(=N)N)CS(=O)(=O)O
IUPAC Name3-carbamimidoylsulfanylpropane-1-sulfonic acid
InChIKeyMQLJIOAPXLAGAP-UHFFFAOYSA-N
INCHI1S/C4H10N2O3S2/c5-4(6)10-2-1-3-11(7,8)9/h1-3H2,(H3,5,6)(H,7,8,9)
Isomeric SMILES C(CSC(=N)N)CS(=O)(=O)O
WGK Germany 3
Molecular Weight 198.26
Reaxy-Rn 1877309
Reaxys-RN_link_address https://www.reaxys.com/reaxys/secured/hopinto.do?context=S&query=IDE.XRN=1877309&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
SuperclassOrganic acids and derivatives
ClassOrganic sulfonic acids and derivatives
SubclassOrganosulfonic acids and derivatives
Intermediate Tree Nodes Not available
Direct ParentOrganosulfonic acids
Alternative Parents Sulfonyls  Alkanesulfonic acids  Isothioureas  Sulfenyl compounds  Carboximidamides  Organopnictogen compounds  Organic oxides  Imines  Hydrocarbon derivatives  
Molecular FrameworkAliphatic acyclic compounds
Substituents Alkanesulfonic acid - Sulfonyl - Organosulfonic acid - Isothiourea - Sulfenyl compound - Carboximidamide - Organic nitrogen compound - Organic oxygen compound - Organopnictogen compound - Organic oxide - Hydrocarbon derivative - Organosulfur compound - Organonitrogen compound - Imine - Aliphatic acyclic compound
DescriptionThis compound belongs to the class of organic compounds known as organosulfonic acids. These are compounds containing the sulfonic acid group, which has the general structure RS(=O)2OH (R is not a hydrogen atom).
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.

13 results found

Lot NumberCertificate TypeDateItem
D2627173Certificate of AnalysisMar 26, 2026 A121968
D2627174Certificate of AnalysisMar 26, 2026 A121968
D2627175Certificate of AnalysisMar 26, 2026 A121968
D2627206Certificate of AnalysisMar 26, 2026 A121968
G2108132Certificate of AnalysisApr 03, 2025 A121968
G2108135Certificate of AnalysisApr 03, 2025 A121968
G2108136Certificate of AnalysisApr 03, 2025 A121968
L2515338Certificate of AnalysisJun 17, 2024 A121968
L2515339Certificate of AnalysisJun 17, 2024 A121968
C2318614Certificate of AnalysisJan 13, 2023 A121968
C2318620Certificate of AnalysisJan 13, 2023 A121968
C2318623Certificate of AnalysisJan 13, 2023 A121968
C2318631Certificate of AnalysisJan 13, 2023 A121968

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Chemical and Physical Properties
Melt Point(°C)254-256°C
Molecular Weight198.300 g/mol
XLogP3-0.600
Hydrogen Bond Donor Count3
Hydrogen Bond Acceptor Count5
Rotatable Bond Count5
Exact Mass198.013 Da
Monoisotopic Mass198.013 Da
Topological Polar Surface Area138.000 Ų
Heavy Atom Count11
Formal Charge0
Complexity218.000
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
Citations of This Product
References
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4. Ran Wang, Wei Song, Hangyuan Xu, Jian Wen, Wanqing Wei, Zhaoyang Chen, Guipeng Hu, Cong Gao, Xiaomin Li, Jia Liu, Jing Wu.  (2025)  Efficient Synthesis of l-Asparagine by an Immobilized Three-Enzyme Cascade Reaction System.  ACS Sustainable Chemistry & Engineering,      [PMID:] [10.1021/acssuschemeng.4c08590]
5. Hongke Wei, Xiaomin Wang, Jiaqi Wang, Shijie Ren, Luis A.J. Mur, Dong Lu, Duo Cao.  (2025)  Flavonoids from sour jujube leaves: Ultrasound-assisted extraction, UPLC-QQQ-MS/MS quantification, and ameliorative effect on DSS-induced ulcerative colitis in mice.  ULTRASONICS SONOCHEMISTRY,      [PMID:39978127] [10.1016/j.ultsonch.2025.107279]
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7. Xinyu Che, Xiangyu Tao, Jianan Chen, Yanbin Feng, Ziheng Cui, Ting Feng, Yunming Fang, Han Wen, Song Xue.  (2025)  Mining Highly Active Oleate Hydratases by Structure Clustering, Sequence Clustering, and Ancestral Sequence Reconstruction.  JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY,      [PMID:40088169] [10.1021/acs.jafc.4c10815]
8. Lu Wang, Qingyue Hong, Huijing Chen, Xiaowei Peng, Zhirong Wang, Jianquan Kan.  (2025)  Different thermal processed qingke: characteristics of in vitro simulated digestion and fermentation.  JOURNAL OF CEREAL SCIENCE,      [PMID:] [10.1016/j.jcs.2025.104204]
9. Lunan Hu, Qihong Liu, Xiao Ke, Peilin Zhao, Wenyi Fang, Yan Ren.  (2025)  Correlation of the intestinal flora and its metabolites with the colonic transport function in functional constipation.  Frontiers in Microbiology,      [PMID:40469730] [10.3389/fmicb.2025.1591697]
10. Simin Gu, Fan Zhang, Ziyao Li, Hejia Qi, Lingxin Huang, Kaifang Liu, Wei Song, Wanqing Wei, Cong Gao, Guipeng Hu, Xiaomin Li, Liming Liu.  (2025)  Engineering a novel adenine-sulfotransferase for efficient synthesis of PAPS and chondroitin sulfate in microbial cells.  TRENDS IN BIOTECHNOLOGY,      [PMID:40610261] [10.1016/j.tibtech.2025.06.005]
11. Feiquan Wang, Huike Li, Zongjie Wu, Jiawei Yan, Hua Feng, Ruihua Liu, Yao Wu, Yiting Liu, Wenlong Lei, Wenmin Fan, Tianmeng Liang, Rongping Chen, Yingao Zhang, Yezi Xiao, Xiaomei Lei, Bo Zhang, Yucheng Zheng, Pengjie Wang.  (2025)  Genomic and Metabolomic Insights into Volatile and Nonvolatile Metabolite Variation from Fresh Leaves to the Turning Stages in Wuyi Rock Tea “Rougui”.  JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY,      [PMID:40982658] [10.1021/acs.jafc.5c06865]
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15. Hui Zhai, Ding Ma, Jin Wang, Wusong Xu, Yifan Jiang, Bixuan Sheng, Qinglong Guo, Zhiguo Li, Ping Guo, Zhengbo Yue.  (2026)  Iron-ceramsite with balanced electron transfer capacity enables simultaneous removal of refractory organics and nitrogen in coking wastewater by single-stage BAF.  CHEMICAL ENGINEERING JOURNAL,      [PMID:] [10.1016/j.cej.2025.172425]
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