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
24,643Navigate 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
102,641Explore 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)
19,704Find 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)
8,783Shop 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
- Cyclo(-D-Ala-D-Ala)CAS: 23927-13-1 Formula: C6H10N2O2 Molecular Weight: 142.16● In Stock — US warehouse, ships to EU* Item #: C348916View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- (3R,6R)-3,6-dimethylpiperazine-2,5-dione
- SMILES
- CC1C(=O)NC(C(=O)N1)C
- InChIKey
- WWISPHBAYBECQZ-QWWZWVQMSA-N
- InChI
- 1S/C6H10N2O2/c1-3-5(9)8-4(2)6(10)7-3/h3-4H,1-2H3,(H,7,10)(H,8,9)/t3-,4-/m1/s1
- Synonyms
- SCHEMBL13074412 | 2,5-Piperazinedione, 3,6-dimethyl-, (3R-cis)- | WMN9UY0GSE | DTXSID50350289 | Alanine anhydride, ci...
- Poly(oxy-1,2-ethanediyl),a-sulfo-w-[1-[(4-nonylphenoxy)methyl]-2-(2-propen-1-yloxy)ethoxy]-,branched, ammonium saltsCAS: 184719-88-8 Formula: C41H77NO16S Molecular Weight: 872.12● In Stock — Germany Item #: B305258View ProductPricing & Pack Sizes
Technical Identifiers
- Leucokinin I◐ .Made to order · 8–12 wks Item #: L118998View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- show more
- SMILES
- CC(C(=O)NC(CC1=CC=CC=C1)C(=O)NC(CC(=O)N)C(=O)NC(CO)C(=O)NC(CC2=CNC3=CC=CC=C32)C(=O)NCC(=O)N)NC(=O)C4CCCN4C(=O)C(CC(=O)O)N
- InChIKey
- ADMFWPBDASJZNU-SKHNUPMMSA-N
- InChI
- show more
- Synonyms
- (S)-4-((S)-2-(((5S,8S,11S,14S,17S)-5-((1H-indol-3-yl)methyl)-1-amino-11-(2-amino-2-oxoethyl)-14-benzyl-8-(hydroxymeth...
- Pizotifen MalateCAS: 5189-11-7 Formula: C19H21NS.C4H6O5 Molecular Weight: 429.53● In Stock — US warehouse, ships to EU* Item #: P129438View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- 2-hydroxybutanedioic acid;1-methyl-4-(6-thiatricyclo[8.4.0.03,7]tetradeca-1(14),3(7),4,10,12-pentaen-2-ylidene)piperidine
- SMILES
- CN1CCC(=C2C3=C(CCC4=CC=CC=C42)SC=C3)CC1.C(C(C(=O)O)O)C(=O)O
- InChIKey
- IWAWCPZVTXCFKD-UHFFFAOYSA-N
- InChI
- show more
- Synonyms
- D08397 | HMS2093G20 | Malic acid, compound with 4-(9,10-dihydro-4H-benzo(4,5)cyclohepta(1,2-b)thien-4-ylidene)-1-meth...
- R(+) -Verapamil monohydrochloride◐ .Made to order · 8–12 wks Item #: R170035View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- (2R)-2-(3,4-dimethoxyphenyl)-5-[2-(3,4-dimethoxyphenyl)ethyl-methylamino]-2-propan-2-ylpentanenitrile;hydrochloride
- SMILES
- CC(C)C(CCCN(C)CCC1=CC(=C(C=C1)OC)OC)(C#N)C2=CC(=C(C=C2)OC)OC.Cl
- InChIKey
- DOQPXTMNIUCOSY-HZPIKELBSA-N
- InChI
- show more
- Synonyms
- AKOS040736385 | UNII-B0P742MK5O | CARPRONIUM CHLORIDE [WHO-DD] | CHEBI:77739 | BENZENEACETONITRILE, .ALPHA.-(3-((2-(3...
- Ramosetron hydrochloride, Serotonin 3 (5-HT3) receptor antagonist● In Stock — US warehouse, ships to EU* Item #: R166990View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- (1-methylindol-3-yl)-[(5R)-4,5,6,7-tetrahydro-3H-benzimidazol-5-yl]methanone;hydrochloride
- SMILES
- CN1C=C(C2=CC=CC=C21)C(=O)C3CCC4=C(C3)NC=N4.Cl
- InChIKey
- XIXYTCLDXQRHJO-RFVHGSKJSA-N
- InChI
- 1S/C17H17N3O.ClH/c1-20-9-13(12-4-2-3-5-16(12)20)17(21)11-6-7-14-15(8-11)19-10-18-14;/h2-5,9-11H,6-8H2,1H3,(H,18,19);1H/t11-;/m1./s1
- Synonyms
- YM060 | YM 060 | YM-060 | AMY15420 | (R)-(-)-Ramosetron Hydrochloride | Tox21_112441_1 | (1-methylindol-3-yl)-[(5R)-4...
- Cyanine7.5 carboxylic acid◐ .Made to order · 8–12 wks Item #: C276385View ProductPricing & Pack Sizes
Technical Identifiers
- Synonyms
- 3-(5
- RutinSolid ≥95%● In Stock — US warehouse, ships to EU* Item #: R189033View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- show more
- SMILES
- CC1C(C(C(C(O1)OCC2C(C(C(C(O2)OC3=C(OC4=CC(=CC(=C4C3=O)O)O)C5=CC(=C(C=C5)O)O)O)O)O)O)O)O
- InChIKey
- IKGXIBQEEMLURG-NVPNHPEKSA-N
- InChI
- show more
- Synonyms
- Ilixanthin | Rutinic acid | Rutinoside, 2-(3,4-dihydroxyphenyl)-5,7-dihydroxy-4-oxo-4H-1-benzopyran-3-yl | 4H-1-Benzo...
- Cyanoferrocene◐ .Made to order · 8–12 wks Item #: C302322View ProductPricing & Pack Sizes
Technical Identifiers
- SMILES
- C1=C[CH]C=C1.C1=CC(=C[CH]1)C#N.[Fe]
- InChIKey
- PHMXECUYNSSRNZ-UHFFFAOYSA-N
- InChI
- 1S/C6H4N.C5H5.Fe/c7-5-6-3-1-2-4-6;1-2-4-5-3-1;/h1-4H;1-5H;
- Synonyms
- Cyclopentadienecarbonitrile; cyclopentadienyliron deriv.; Ferrocenyl cyanide; Ferrocenylnitrile
- Propargyl-N-hydroxysuccinimidyl esterCAS: 1174157-65-3 EC Number: 851-498-9 PubChem CID: 51340986 Formula: C10H11NO5 Molecular Weight: 225.2● In Stock — US warehouse, ships to EU* Item #: P166237View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- (2,5-dioxopyrrolidin-1-yl) 3-prop-2-ynoxypropanoate
- SMILES
- C#CCOCCC(=O)ON1C(=O)CCC1=O
- InChIKey
- WKIKHHMUNOVQLD-UHFFFAOYSA-N
- InChI
- 1S/C10H11NO5/c1-2-6-15-7-5-10(14)16-11-8(12)3-4-9(11)13/h1H,3-7H2
- Synonyms
- 3-(2-Propyn-1-yloxy)propanoic acid 2,5-dioxo-1-pyrrolidinyl ester | 2,5-dioxopyrrolidin-1-yl 3-(prop-2-ynyloxy)propan...
- Ammonium octamolybdate● In Stock — Germany Item #: A302283View ProductPricing & Pack Sizes
Technical Identifiers
- LY310762CAS: 192927-92-7 Formula: C24H27FN2O2·HCl Molecular Weight: 430.94● In Stock — US warehouse, ships to EU* Item #: L129692View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- 1-[2-[4-(4-fluorobenzoyl)piperidin-1-yl]ethyl]-3,3-dimethylindol-2-one;hydrochloride
- SMILES
- CC1(C2=CC=CC=C2N(C1=O)CCN3CCC(CC3)C(=O)C4=CC=C(C=C4)F)C.Cl
- InChIKey
- BOCLFQZPFYNVFD-UHFFFAOYSA-N
- InChI
- 1S/C24H27FN2O2.ClH/c1-24(2)20-5-3-4-6-21(20)27(23(24)29)16-15-26-13-11-18(12-14-26)22(28)17-7-9-19(25)10-8-17;/h3-10,18H,11-16H2,1-2H3;1H
- Synonyms
- HB1751 | 1-[2-[4-(4-Fluorobenzoyl)-1-piperidinyl]ethyl]-1,3-dihydro-3,3-dimethyl-2H-indol-2-one hydrochloride | CP 11...
![Poly(oxy-1,2-ethanediyl),a-sulfo-w-[1-[(4-nonylphenoxy)methyl]-2-(2-propen-1-yloxy)ethoxy]-,branched, ammonium salts - 90%, used for , CAS No. 184719-88-8, by Aladdin Scientific](https://www.aladdinsci.com/media/catalog/product/placeholder/default/default_5.jpg)
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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.