Explore small molecules, screening libraries, and tool compounds for discovery research. Browse by target, pathway, or ligand family to quickly find inhibitors, agonists, and chemical probes, with searchable structure/CAS data and supporting documents (SDS/COA where available).
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Ready-to-screen compound libraries and focused sets for hit discovery. Browse libraries by target class, pathway, scaffold, or application, and review size, format, and compound information to build screening panels.Customize Your Screening Library to choose compounds, format, and volume, and we’ll prepare a ready-to-use set for you.Customize Your Screening Library
Ligand families
24,653Navigate small molecules by ligand family or scaffold to build focused sets and explore structure–activity relationships. This category groups related chemotypes, helping you select analogs, fragments, and tool molecules for discovery research.
ADC-focused building blocks and tools to support antibody–drug conjugate research. Explore payloads, linkers, conjugation reagents, and related small-molecule components (where available) for designing and evaluating ADC constructs.
PROTAC
2,812PROTAC and targeted protein degradation tools for discovery research. Browse degrader-related ligands, linkers, and building blocks (where available) to assemble or screen PROTAC designs, with clear identifiers for efficient selection.
By Signaling Pathways
102,663Explore pathway-focused tool compounds to study and modulate key signaling cascades. Browse small molecules grouped by signaling pathway to support mechanism studies, phenotypic assays, and target validation, with clear identifiers for fast searching.
By Target (DTO)
19,717Find bioactive small molecules organized by protein target (DTO). Quickly locate tool compounds for specific targets and compare identifiers such as structure, CAS, and synonyms—plus supporting documents (where available)—to build screening and validation sets.
By Disease (DOID)
8,794Shop small molecules and tool compounds organized by disease area (DOID). Discover chemical probes, libraries, and related products mapped to therapeutic areas to help assemble compound sets for screening, pathway exploration, and model studies.
Popular Products
- Boc-D-Glu-OMe● In Stock — US Item #: B356839View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- (4R)-5-methoxy-4-[(2-methylpropan-2-yl)oxycarbonylamino]-5-oxopentanoic acid
- SMILES
- CC(C)(C)OC(=O)NC(CCC(=O)O)C(=O)OC
- InChIKey
- ZAYAFKXUQMTLPL-SSDOTTSWSA-N
- InChI
- 1S/C11H19NO6/c1-11(2,3)18-10(16)12-7(9(15)17-4)5-6-8(13)14/h7H,5-6H2,1-4H3,(H,12,16)(H,13,14)/t7-/m1/s1
- Synonyms
- EN300-1589423 | (R)-4-((tert-Butoxycarbonyl)amino)-5-methoxy-5-oxopentanoic acid | BOC-D-GLU-OME | AS-49058 | (4R)-5-...
- NF 023 hydrateCAS: 104869-31-0 Formula: C35H20N4Na6O21S6·12·5H2O Molecular Weight: 1388.02Solid ≥94%● In Stock — US Item #: N275685View ProductPricing & Pack Sizes
Technical Identifiers
- SMILES
- show more
- InChIKey
- GKOOKWDOKJAVBD-UHFFFAOYSA-N
- InChI
- show more
- Synonyms
- PUBCHEM_53249227 | NF 023 | 1,3,5-Naphthalenetrisulfonicacid, 8,8'-[carbonylbis(imino-3,1-phenylenecarbonylimino)]bis...
- NESS 0327CAS: 494844-07-4 Formula: C24H23Cl3N4O Molecular Weight: 489.82● In Stock — US Item #: N287522View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- 12-chloro-3-(2,4-dichlorophenyl)-N-piperidin-1-yl-3,4-diazatricyclo[8.4.0.02,6]tetradeca-1(10),2(6),4,11,13-pentaene-5-carboxamide
- SMILES
- C1CCN(CC1)NC(=O)C2=NN(C3=C2CCCC4=C3C=CC(=C4)Cl)C5=C(C=C(C=C5)Cl)Cl
- InChIKey
- NCXBPZJQQSNIRA-UHFFFAOYSA-N
- InChI
- show more
- Synonyms
- HY-117139 | 8-Chloro-1-(2,4-dichlorophenyl)-1,4,5,6-tetrahydro-N-1-piperidinyl-benzo[6,7]cyclohepta[1,2-c]pyrazole-3-...
- Boc-O-benzyl-L-tyrosine aldehydeCAS: 82689-15-4 Formula: C21H25NO4 Molecular Weight: 355.43◐ .Made to order · 8–12 wks Item #: B356638View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- tert-butyl N-[(2S)-1-oxo-3-(4-phenylmethoxyphenyl)propan-2-yl]carbamate
- SMILES
- CC(C)(C)OC(=O)NC(CC1=CC=C(C=C1)OCC2=CC=CC=C2)C=O
- InChIKey
- SLSOSKGFUOFMCP-SFHVURJKSA-N
- InChI
- 1S/C21H25NO4/c1-21(2,3)26-20(24)22-18(14-23)13-16-9-11-19(12-10-16)25-15-17-7-5-4-6-8-17/h4-12,14,18H,13,15H2,1-3H3,(H,22,24)/t18-/m0/s1
- Synonyms
- Boc-Tyr(Bzl)-Aldehyde
- Boc-L-tryptophan benzyl esterCAS: 57229-67-1 Formula: C23H26N2O4 Molecular Weight: 394.46● In Stock — US Item #: B356832View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- benzyl (2S)-3-(1H-indol-3-yl)-2-[(2-methylpropan-2-yl)oxycarbonylamino]propanoate
- SMILES
- CC(C)(C)OC(=O)NC(CC1=CNC2=CC=CC=C21)C(=O)OCC3=CC=CC=C3
- InChIKey
- CEMCPAAFDOVLDW-FQEVSTJZSA-N
- InChI
- show more
- Synonyms
- N-Boc-L-tryptophan benzyl ester
- Boc-Lys(Boc)-Pro-OH● In Stock — US Item #: B357342View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- (2S)-1-[(2S)-2,6-bis[(2-methylpropan-2-yl)oxycarbonylamino]hexanoyl]pyrrolidine-2-carboxylic acid
- SMILES
- CC(C)(C)OC(=O)NCCCCC(C(=O)N1CCCC1C(=O)O)NC(=O)OC(C)(C)C
- InChIKey
- CNUJKNMOGSRQMN-GJZGRUSLSA-N
- InChI
- show more
- Synonyms
- Boc-Lys(Boc)-Pro-OH | 4,4-[(3,5-Dimethylphenyl)imino]bis-1-butanesulfonicaciddisodiumsalt | DTXSID70718544 | SCHEMBL1...
- Ondansetron hydrochlorideCAS: 99614-01-4 Formula: C18H19N3O.HCl Molecular Weight: 329.83● In Stock — US Item #: O275545View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- 9-methyl-3-[(2-methylimidazol-1-yl)methyl]-2,3-dihydro-1H-carbazol-4-one;hydrochloride
- SMILES
- CC1=NC=CN1CC2CCC3=C(C2=O)C4=CC=CC=C4N3C.Cl
- InChIKey
- MKBLHFILKIKSQM-UHFFFAOYSA-N
- InChI
- 1S/C18H19N3O.ClH/c1-12-19-9-10-21(12)11-13-7-8-16-17(18(13)22)14-5-3-4-6-15(14)20(16)2;/h3-6,9-10,13H,7-8,11H2,1-2H3;1H
- Synonyms
- Monohydrochloride Dihydrate, Ondansetron | MLS001304076 | Monohydrochloride, Ondansetron | Emeset | Ondansetron hydro...
- TriptolideSolid Analytical standard ? Analytical standard — certified-purity material for quantitative calibration. Use to prepare calibration standards and validate analytical methods. Moligand™ ? Moligand™ — Aladdin's line of ligands and bioactive small molecules. Use for receptor, pathway, and binding studies needing defined small-molecule tools. ≥98%● In Stock — US Item #: T107399View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- (1S,2S,4S,5S,7R,8R,9S,11S,13S)-8-hydroxy-1-methyl-7-propan-2-yl-3,6,10,16-tetraoxaheptacyclo[11.7.0.02,4.02,9.05,7.09,11.014,18]icos-14(18)-en-17-one
- SMILES
- CC(C)C12C(O1)C3C4(O3)C5(CCC6=C(C5CC7C4(C2O)O7)COC6=O)C
- InChIKey
- DFBIRQPKNDILPW-CIVMWXNOSA-N
- InChI
- show more
- Synonyms
- HY-32735 | NSC839303 | NSC-839303 | CAS-5611-51-8 | SCHEMBL413634 | MLS000759410 | NCGC00163411-02 | BSPBio_001595 | ...
- Boc-S-3,4-dimethylbenzyl-L-cysteineCAS: 41117-66-2 Formula: C17H25NO4S Molecular Weight: 339.45● In Stock — US Item #: B354957View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- (2R)-3-[(3,4-dimethylphenyl)methylsulfanyl]-2-[(2-methylpropan-2-yl)oxycarbonylamino]propanoic acid
- SMILES
- CC1=C(C=C(C=C1)CSCC(C(=O)O)NC(=O)OC(C)(C)C)C
- InChIKey
- AYUOVKILVZAKFO-AWEZNQCLSA-N
- InChI
- 1S/C17H25NO4S/c1-11-6-7-13(8-12(11)2)9-23-10-14(15(19)20)18-16(21)22-17(3,4)5/h6-8,14H,9-10H2,1-5H3,(H,18,21)(H,19,20)/t14-/m0/s1
- Synonyms
- DTXSID30426870 | (2R)-3-[(3,4-dimethylphenyl)methylsulfanyl]-2-[(2-methylpropan-2-yl)oxycarbonylamino]propanoic acid ...
- Boc-D-alpha-(5-bromothienyl)alanineCAS: 261380-16-9 Formula: C12H16BrNO4S Molecular Weight: 350.23● In Stock — US Item #: B355888View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- (2R)-3-(5-bromothiophen-2-yl)-2-[(2-methylpropan-2-yl)oxycarbonylamino]propanoic acid
- SMILES
- CC(C)(C)OC(=O)NC(CC1=CC=C(S1)Br)C(=O)O
- InChIKey
- HHNNFRCLMQFXBA-MRVPVSSYSA-N
- InChI
- 1S/C12H16BrNO4S/c1-12(2,3)18-11(17)14-8(10(15)16)6-7-4-5-9(13)19-7/h4-5,8H,6H2,1-3H3,(H,14,17)(H,15,16)/t8-/m1/s1
- Boc-D-aspartic acid alpha-9-fluorenylmethyl esterSolid● In Stock — US Item #: B356204View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- 4-(9H-fluoren-9-ylmethoxy)-3-[(2-methylpropan-2-yl)oxycarbonylamino]-4-oxobutanoic acid
- SMILES
- CC(C)(C)OC(=O)NC(CC(=O)O)C(=O)OCC1C2=CC=CC=C2C3=CC=CC=C13
- InChIKey
- RMRKPGGMJKNMSK-UHFFFAOYSA-N
- InChI
- 1S/C23H25NO6/c1-23(2,3)30-22(28)24-19(12-20(25)26)21(27)29-13-18-16-10-6-4-8-14(16)15-9-5-7-11-17(15)18/h4-11,18-19H,12-13H2,1-3H3,(H,24,28)(H,25,26)
- Synonyms
- BOC-D-ASP-OFM
- SN50 trifluoroacetate saltCAS: 213546-53-3(free basis) Formula: C129H230N36O29S · xC2HF3O2 Molecular Weight: 2781.50(free basis)● In Stock — US Item #: N341452View ProductPricing & Pack Sizes
Technical Identifiers
- Synonyms
- SN50 TFA
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Frequently Asked Questions
What does the By Target/Pathway/Disease listing cover?
It groups compounds associated with targets in By Target/Pathway/Disease, organised so you can move from the pathway to an individual target and then to a specific chemotype. Each entry carries structure, CAS number, and reported activity.
How is By Target/Pathway/Disease organised?
By Target/Pathway/Disease is broken down into Compound Libraries, PROTACs, molecular glues and other degraders and Antibody-drug Conjugates(ADC). Compounds acting on more than one node appear under each relevant target.
How do I choose compounds for By Target/Pathway/Disease research?
For By Target/Pathway/Disease, pick a well-characterised reference compound for the node you want to perturb, and pair it with a structurally unrelated compound hitting the same target — that is the cleanest way to separate pathway effects from off-target ones. Check potency, selectivity, and cell permeability against your assay format. All products are supplied for professional research and development use only, and are not for use in humans, animals, diagnostics, or therapy.
How do I find a specific compound within By Target/Pathway/Disease?
Search By Target/Pathway/Disease by compound name, CAS number, or SMILES, or drill down through the target listing. Unlisted compounds and bulk quantities: [email protected]. We supply verified businesses, research institutions, universities, and government agencies.