Chemical building blocks for synthesis and medicinal chemistry, including functionalized intermediates and protected reagents (where available). Browse by chemistry type to source starting materials and accelerate route development.
Building Blocks
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Explore fluorinated building blocks for medicinal chemistry, agrochemical design, and route development. Use these intermediates to introduce fluorine-containing motifs that tune potency, stability, and physicochemical properties.
Browse halogenated heterocycles for cross-coupling, scaffold diversification, and medicinal chemistry workflows. These intermediates help support rapid analogue synthesis around heteroaromatic cores.
Find heterocyclic building blocks used in drug discovery, library design, and synthetic route planning. Compare ring systems and functionalized intermediates for efficient scaffold assembly.
Organic Building Blocks
81,479Source organic building blocks for synthesis, route scouting, and lead optimization. This page helps you find starting materials and intermediates across a broad range of functional groups and scaffolds.
Popular Products
- (+)-Dibenzoyl-D-tartaric AcidCAS: 17026-42-5 Formula: C18H14O8 Molecular Weight: 358.3In Stock Item #: D154781View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- (2S,3S)-2,3-dibenzoyloxybutanedioic acid
- SMILES
- C1=CC=C(C=C1)C(=O)OC(C(C(=O)O)OC(=O)C2=CC=CC=C2)C(=O)O
- InChIKey
- YONLFQNRGZXBBF-KBPBESRZSA-N
- InChI
- 1S/C18H14O8/c19-15(20)13(25-17(23)11-7-3-1-4-8-11)14(16(21)22)26-18(24)12-9-5-2-6-10-12/h1-10,13-14H,(H,19,20)(H,21,22)/t13-,14-/m0/s1
- Synonyms
- D-(+)-Di-O,O-benzoyltartaric acid | D3826 | (2S,3S)-2,3-dibenzoyloxybutanedioic acid | Dibenzoyltartaric acid, (+)-D-...
- (1R,2R)-(-)-1-Amino-2-indanolCAS: 163061-73-2 Formula: C9H11NO Molecular Weight: 149.19In Stock Item #: R160940View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- (1R,2R)-1-amino-2,3-dihydro-1H-inden-2-ol
- SMILES
- C1C(C(C2=CC=CC=C21)N)O
- InChIKey
- LOPKSXMQWBYUOI-RKDXNWHRSA-N
- InChI
- 1S/C9H11NO/c10-9-7-4-2-1-3-6(7)5-8(9)11/h1-4,8-9,11H,5,10H2/t8-,9-/m1/s1
- Synonyms
- (1R,2R)-1-amino-2,3-dihydro-1H-inden-2-ol | C44ZZ4E55A | 1H-Inden-2-ol, 1-amino-2,3-dihydro-, (1R,2R)-rel- | D86558 |...
- (S)-(-)-1,1,2-Triphenyl-1,2-ethanediolCAS: 108998-83-0 Formula: C20H18O2 Molecular Weight: 290.36In Stock Item #: I165871View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- (2S)-1,1,2-triphenylethane-1,2-diol
- SMILES
- C1=CC=C(C=C1)C(C(C2=CC=CC=C2)(C3=CC=CC=C3)O)O
- InChIKey
- GWVWUZJOQHWMFB-IBGZPJMESA-N
- InChI
- 1S/C20H18O2/c21-19(16-10-4-1-5-11-16)20(22,17-12-6-2-7-13-17)18-14-8-3-9-15-18/h1-15,19,21-22H/t19-/m0/s1
- Synonyms
- AC-8872 | (S)-2,2,1-Triphenyl-ethane-1,2-diol | MFCD00075492 | (S)-1,1,2-Triphenyl-1,2-ethanediol | DTXSID501294087 |...
- (S)-(-)-1-(1-Naphthyl)ethylamineCAS: 10420-89-0 Formula: C12H13N Molecular Weight: 171.24In Stock Item #: N122375View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- (1S)-1-naphthalen-1-ylethanamine
- SMILES
- CC(C1=CC=CC2=CC=CC=C21)N
- InChIKey
- RTCUCQWIICFPOD-VIFPVBQESA-N
- InChI
- 1S/C12H13N/c1-9(13)11-8-4-6-10-5-2-3-7-12(10)11/h2-9H,13H2,1H3/t9-/m0/s1
- Synonyms
- AI3-26858 | (1S)-1-naphthalen-1-ylethanamine | 1-Naphthalenemethanamine, alpha-methyl-, (.alpha.S)- | (1S)-(-)-1-(Nap...
- (S)-(-)-1-Phenylpropyl isothiocyanateOut of Stock Item #: S300509View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- [(1S)-1-isothiocyanatopropyl]benzene
- SMILES
- CCC(C1=CC=CC=C1)N=C=S
- InChIKey
- KLNMIWGOGGBFNV-JTQLQIEISA-N
- InChI
- 1S/C10H11NS/c1-2-10(11-8-12)9-6-4-3-5-7-9/h3-7,10H,2H2,1H3/t10-/m0/s1
- Synonyms
- (S)-(-)-1-Phenylpropyl isothiocyanate|737001-04-6|[(1S)-1-ISOTHIOCYANATOPROPYL]BENZENE|DTXSID20426965|AKOS025295680
- LucidinCAS: 478-08-0 Formula: C15H10O5 Molecular Weight: 270.24Solid ≥98%Out of Stock Item #: L126020View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- 1,3-dihydroxy-2-(hydroxymethyl)anthracene-9,10-dione
- SMILES
- C1=CC=C2C(=C1)C(=O)C3=CC(=C(C(=C3C2=O)O)CO)O
- InChIKey
- AMIDUPFSOUCLQB-UHFFFAOYSA-N
- InChI
- 1S/C15H10O5/c16-6-10-11(17)5-9-12(15(10)20)14(19)8-4-2-1-3-7(8)13(9)18/h1-5,16-17,20H,6H2
- Synonyms
- 1,3-Dihydroxy-2-hydroxymethylanthraquinoline | WLN: L C666 BV IVJ DQ E1Q FQ | NSC 30546;Henine;1,3-Dihydroxy-2-(hydro...
- RetaspimycinCAS: 857402-23-4 Formula: C31H45N3O8 Molecular Weight: 587.7Out of Stock Item #: R127859View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- show more
- SMILES
- CC1CC(C(C(C=C(C(C(C=CC=C(C(=O)NC2=CC(=C(C(=C2O)C1)NCC=C)O)C)OC)OC(=O)N)C)C)O)OC
- InChIKey
- OAKGNIRUXAZDQF-TXHRRWQRSA-N
- InChI
- show more
- Synonyms
- D09375 | IPI-504 | (4E,6Z,8S,9S,10E,12S,13R,14S,16R)-13,20,22-Trihydroxy-8,14-dimethoxy-4,10,12,16-tetramethyl-3-oxo-...
- N3PTOut of Stock Item #: N124910View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- 2-[3-[(2-amino-6-methylpyridin-3-yl)methyl]-4-methyl-1,3-thiazol-3-ium-5-yl]ethanol;chloride;hydrochloride
- SMILES
- CC1=NC(=C(C=C1)C[N+]2=CSC(=C2C)CCO)N.Cl.[Cl-]
- InChIKey
- ZLGKCAQWOASSTP-UHFFFAOYSA-M
- InChI
- 1S/C13H18N3OS.2ClH/c1-9-3-4-11(13(14)15-9)7-16-8-18-12(5-6-17)10(16)2;;/h3-4,8,17H,5-7H2,1-2H3,(H2,14,15);2*1H/q+1;;/p-1
- LevoglucosenoneCAS: 37112-31-5 Formula: C6H6O3 Molecular Weight: 126.11In Stock Item #: L130870View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- (1S,5R)-6,8-dioxabicyclo[3.2.1]oct-2-en-4-one
- SMILES
- C1C2C=CC(=O)C(O1)O2
- InChIKey
- HITOXZPZGPXYHY-UJURSFKZSA-N
- InChI
- 1S/C6H6O3/c7-5-2-1-4-3-8-6(5)9-4/h1-2,4,6H,3H2/t4-,6+/m0/s1
- Synonyms
- 1,6-Anhydro-3,4-dideoxyhex-3-enopyran-2-ulose | BRN 4859778 | BCP07825 | CHEBI:30999 | 1,6-ANHYDRO-3,4-DIDEOXY-.BETA....
- Carbon Dioxide (Carbonate) Ion Selective Electrode SolutionsISAOut of Stock Item #: I123796View ProductPricing & Pack Sizes
Technical Identifiers
- BTQBT (purified by sublimation)CAS: 135704-54-0 Formula: C12H4N4S6 Molecular Weight: 396.55Out of Stock Item #: B153081View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- 4,8-bis(1,3-dithiol-2-ylidene)-[1,2,5]thiadiazolo[3,4-f][2,1,3]benzothiadiazole
- SMILES
- C1=CSC(=C2C3=NSN=C3C(=C4SC=CS4)C5=NSN=C25)S1
- InChIKey
- ABMLGFPCLXTCEI-UHFFFAOYSA-N
- InChI
- 1S/C12H4N4S6/c1-2-18-11(17-1)5-7-9(15-21-13-7)6(12-19-3-4-20-12)10-8(5)14-22-16-10/h1-4H
- Synonyms
- SCHEMBL17119008 | D89028 | Bis(1,2,5-thiadiazolo)-p-quinobis(1,3-dithiole) | BTQBT | 4,8-Bis(2H-1,3-dithiol-2-ylidene...
- Bis(4-hydroxy-3,5-dimethylphenyl) SulfoneCAS: 13288-70-5 Formula: C16H18O4S Molecular Weight: 306.38Solid ≥98%Out of Stock Item #: B153216View ProductPricing & Pack Sizes
Technical Identifiers
- IUPAC Name
- 4-(4-hydroxy-3,5-dimethylphenyl)sulfonyl-2,6-dimethylphenol
- SMILES
- CC1=CC(=CC(=C1O)C)S(=O)(=O)C2=CC(=C(C(=C2)C)O)C
- InChIKey
- SUCTVKDVODFXFX-UHFFFAOYSA-N
- InChI
- 1S/C16H18O4S/c1-9-5-13(6-10(2)15(9)17)21(19,20)14-7-11(3)16(18)12(4)8-14/h5-8,17-18H,1-4H3
- Synonyms
- BS-43872 | SCHEMBL142565 | SUCTVKDVODFXFX-UHFFFAOYSA-N | InChI=1/C16H18O4S/c1-9-5-13(6-10(2)15(9)17)21(19,20)14-7-11(...
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Frequently Asked Questions
How do I choose the right building block for my synthesis route?
Start with the target structure and work backwards. Identify the key bonds to be formed, then select building blocks with the right functional groups, protection patterns, and stereochemistry. Compare purity, scale availability, and stability for your reaction conditions.
Which building block subcategory should I start with?
Use Heterocyclic Building Blocks for ring-containing scaffolds common in pharmaceuticals, Fluorinated Building Blocks for medicinal chemistry with fluorine motifs, Halogenated Heterocycles for cross-coupling precursors, and Organic Building Blocks for general synthesis inputs.
What specifications matter most for synthesis building blocks?
Focus on purity (≥95% or higher for medicinal chemistry), stereochemistry, water content for moisture-sensitive groups, isomeric purity for chiral compounds, and pack size matching your scale. Storage conditions also matter for unstable functional groups.
Can I find building blocks with specific functional groups?
Yes. Use the filters to narrow by functional group, ring system, halogen, or protective group. You can also search by molecular formula, CAS number, or SMILES string to find exact structures or close analogs.