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).
By Target / Pathway / Disease
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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
24,642Navigate 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
2,814PROTAC 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
102,635Explore 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)
19,700Find 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)
8,782Shop 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
- Tert-butyl 5-aminopyridin-2-ylcarbamate● In Stock — US warehouse, ships to EU* Item #: T303080View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- tert-butyl N-(5-aminopyridin-2-yl)carbamate
- SMILES
- CC(C)(C)OC(=O)NC1=NC=C(C=C1)N
- InChIKey
- NHVPESPHUUFULF-UHFFFAOYSA-N
- InChI
- 1S/C10H15N3O2/c1-10(2,3)15-9(14)13-8-5-4-7(11)6-12-8/h4-6H,11H2,1-3H3,(H,12,13,14)
- Synonyms
- W-206725 | tert-Butyl(5-aminopyridin-2-yl)carbamate | AS-19786 | Carbamic acid, (5-amino-2-pyridinyl)-, 1,1-dimethyle...
- 8-Ethyl-2-propyl-4-quinolinol● In Stock — US warehouse, ships to EU* Item #: E344052View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- 8-ethyl-2-propyl-1H-quinolin-4-one
- SMILES
- CCCC1=CC(=O)C2=CC=CC(=C2N1)CC
- InChIKey
- WSKVYQCYWIBUCH-UHFFFAOYSA-N
- InChI
- 1S/C14H17NO/c1-3-6-11-9-13(16)12-8-5-7-10(4-2)14(12)15-11/h5,7-9H,3-4,6H2,1-2H3,(H,15,16)
- Synonyms
- 1070879-89-8 | MFCD11505252 | 8-ethyl-2-propylquinolin-4-ol | DTXSID80653735 | 8-Ethyl-2-propylquinolin-4(1H)-one | 8...
- KW-2478CAS: 819812-04-9 Formula: C30H42N2O9 Molecular Weight: 574.66● In Stock — US warehouse, ships to EU* Item #: K129723View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- 2-[2-ethyl-3,5-dihydroxy-6-[3-methoxy-4-(2-morpholin-4-ylethoxy)benzoyl]phenyl]-N,N-bis(2-methoxyethyl)acetamide
- SMILES
- CCC1=C(C(=C(C=C1O)O)C(=O)C2=CC(=C(C=C2)OCCN3CCOCC3)OC)CC(=O)N(CCOC)CCOC
- InChIKey
- VFUXSYAXEKYYMB-UHFFFAOYSA-N
- InChI
- show more
- Synonyms
- BS-18163 | EX-A035 | SCHEMBL440470 | Asparagine, L- (8CI) | KW2478 | KW-2478 | 2-(2-ethyl-3,5-dihydroxy-6-(3-methoxy-...
- ImportazoleCAS: 662163-81-7 Formula: C20H22N4 Molecular Weight: 318.42Solid ≥98%● In Stock — US warehouse, ships to EU* Item #: I304313View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- N-(1-phenylethyl)-2-pyrrolidin-1-ylquinazolin-4-amine
- SMILES
- CC(C1=CC=CC=C1)NC2=NC(=NC3=CC=CC=C32)N4CCCC4
- InChIKey
- HKGJEZIGDHFJFL-UHFFFAOYSA-N
- InChI
- 1S/C20H22N4/c1-15(16-9-3-2-4-10-16)21-19-17-11-5-6-12-18(17)22-20(23-19)24-13-7-8-14-24/h2-6,9-12,15H,7-8,13-14H2,1H3,(H,21,22,23)
- Ethyl 6-bromo-4-chloroquinazoline-2-carboxylateCAS: 1159976-38-1 EC Number: 812-156-4 PubChem CID: 45599702 Formula: C11H8N2O2ClBr Molecular Weight: 315.55◐ .Made to order · 8–12 wks Item #: E357970View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- ethyl 6-bromo-4-chloroquinazoline-2-carboxylate
- SMILES
- CCOC(=O)C1=NC2=C(C=C(C=C2)Br)C(=N1)Cl
- InChIKey
- LVPLDTSUQVYGIZ-UHFFFAOYSA-N
- InChI
- 1S/C11H8BrClN2O2/c1-2-17-11(16)10-14-8-4-3-6(12)5-7(8)9(13)15-10/h3-5H,2H2,1H3
- Synonyms
- DTXSID90671243 | 2-Quinazolinecarboxylic acid, 6-bromo-4-chloro-, ethyl ester | E84130 | Ethyl 6-bromo-4-chloroquinaz...
- 6-(γ,γ-Dimethylallylamino)purine● In Stock — US warehouse, ships to EU* Item #: D168889View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- N-(3-methylbut-2-enyl)-7H-purin-6-amine
- SMILES
- CC(=CCNC1=NC=NC2=C1NC=N2)C
- InChIKey
- HYVABZIGRDEKCD-UHFFFAOYSA-N
- InChI
- 1S/C10H13N5/c1-7(2)3-4-11-9-8-10(13-5-12-8)15-6-14-9/h3,5-6H,4H2,1-2H3,(H2,11,12,13,14,15)
- Synonyms
- N-(3-Methyl-2-butenyl)-1H-purin-6-amine # | N6-(2-Isopentenyl)adenine | N6-(2-Isopentenyl)-adenine | 3-methylbut-2-en...
- Diclofenac DiethylamineSolid ≥99%● In Stock — US warehouse, ships to EU* Item #: D129411View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- 2-[2-(2,6-dichloroanilino)phenyl]acetic acid;N-ethylethanamine
- SMILES
- CCNCC.C1=CC=C(C(=C1)CC(=O)O)NC2=C(C=CC=C2Cl)Cl
- InChIKey
- ZQVZPANTCLRASL-UHFFFAOYSA-N
- InChI
- 1S/C14H11Cl2NO2.C4H11N/c15-10-5-3-6-11(16)14(10)17-12-7-2-1-4-9(12)8-13(18)19;1-3-5-4-2/h1-7,17H,8H2,(H,18,19);5H,3-4H2,1-2H3
- Synonyms
- SW219367-1 | SY066416 | HY-15036A | DICLOFENAC DIETHYLAMINE [WHO-DD] | Pregnan-20-one, 3,11,17,21-tetrahydroxy-, (3al...
- Cupric Sulfate,Basic● In Stock — Germany Item #: C302441View ProductPricing & Pack Sizes
Technical Identifiers
- Cupric oxalate● In Stock — US warehouse, ships to EU* Item #: C304075View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- copper;oxalate
- SMILES
- C(=O)(C(=O)[O-])[O-].[Cu+2]
- InChIKey
- QYCVHILLJSYYBD-UHFFFAOYSA-L
- InChI
- 1S/C2H2O4.Cu/c3-1(4)2(5)6;/h(H,3,4)(H,5,6);/q;+2/p-2
- Synonyms
- QYCVHILLJSYYBD-UHFFFAOYSA-L | Copper oxalate (CuC2O4) | DTXSID0041802 | CUPRIC OXALATE [MI] | Ethanedioic acid, coppe...
- Manganese Sulfate SolutionCAS: 7785-87-7 Formula: MnO4S Molecular Weight: 1510.5M● In Stock — US warehouse, ships to EU* Item #: M304624View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- manganese(2+);sulfate
- SMILES
- [O-]S(=O)(=O)[O-].[Mn+2]
- InChIKey
- SQQMAOCOWKFBNP-UHFFFAOYSA-L
- InChI
- 1S/Mn.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2
- Synonyms
- Manganese sulphate|Manganese(II) sulfate|7785-87-7|Manganous sulfate|Manganese sulfate anhydrous|Sorba-spray Mn|Man-G...
- Manganese gluconate● In Stock — Germany Item #: M304281View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- manganese(2+);(2R,3S,4R,5R)-2,3,4,5,6-pentahydroxyhexanoate
- SMILES
- C(C(C(C(C(C(=O)[O-])O)O)O)O)O.C(C(C(C(C(C(=O)[O-])O)O)O)O)O.[Mn+2]
- InChIKey
- OXHQNTSSPHKCPB-IYEMJOQQSA-L
- InChI
- 1S/2C6H12O7.Mn/c2*7-1-2(8)3(9)4(10)5(11)6(12)13;/h2*2-5,7-11H,1H2,(H,12,13);/q;;+2/p-2/t2*2-,3-,4+,5-;/m11./s1
- Synonyms
- AKOS015901565 | Manganese(2+) dihexonate | Manganese(II) gluconate | Bis(D-gluconato-O(sup 1),O(sup 2)) manganese | m...
- Pyrazine-2-carboxamidine hydrochlorideCAS: 138588-41-7 Formula: C5H7ClN4 Molecular Weight: 158.59● In Stock — US warehouse, ships to EU* Item #: P344029View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- pyrazine-2-carboximidamide;hydrochloride
- SMILES
- C1=CN=C(C=N1)C(=N)N.Cl
- InChIKey
- FCVKLVNLBIBCCU-UHFFFAOYSA-N
- InChI
- 1S/C5H6N4.ClH/c6-5(7)4-3-8-1-2-9-4;/h1-3H,(H3,6,7);1H
- Synonyms
- MFCD00052151 | pyrazine-2-carboximidamide hydrochloride | Z1741973428 | EN300-7365596 | FT-0645803 | J-524076 | pyraz...
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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.