(1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one

C116H160N16O17 — CID 167608928

IUPAC(1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one
SMILESCCC(=O)[C@@H]1C[C@]23COCCCCCNCc4cc(C(C)C)cc5c(C(C)=O)nn(c45)CC(=O)N1[C@@H]2C3.CCC(=O)[C@@H]1C[C@]23COCCCCCNCc4cc(C)cc5c(C(C)=O)nn(c45)CC(=O)N1[C@@H]2C3.CCC(=O)[C@@H]1C[C@]23COCCCCCNCc4cc(CCC(C)C)cc5c(C(C)=O)nn(c45)CC(=O)N1[C@@H]2C3.CCC(=O)[C@@H]1C[C@]23COCCCCCNCc4cc(OC(C)C)cc5c(C(C)=O)nn(c45)CC(=O)N1[C@@H]2C3
InChIInChI=1S/C31H44N4O4.C29H40N4O5.C29H40N4O4.C27H36N4O4/c1-5-26(37)25-15-31-16-27(31)35(25)28(38)18-34-30-23(17-32-11-7-6-8-12-39-19-31)13-22(10-9-20(2)3)14-24(30)29(33-34)21(4)36;1-5-24(35)23-13-29-14-25(29)33(23)26(36)16-32-28-20(15-30-9-7-6-8-10-37-17-29)11-21(38-18(2)3)12-22(28)27(31-32)19(4)34;1-5-24(35)23-13-29-14-25(29)33(23)26(36)16-32-28-21(15-30-9-7-6-8-10-37-17-29)11-20(18(2)3)12-22(28)27(31-32)19(4)34;1-4-22(33)21-12-27-13-23(27)31(21)24(34)15-30-26-19(14-28-8-6-5-7-9-35-16-27)10-17(2)11-20(26)25(29-30)18(3)32/h13-14,20,25,27,32H,5-12,15-19H2,1-4H3;11-12,18,23,25,30H,5-10,13-17H2,1-4H3;11-12,18,23,25,30H,5-10,13-17H2,1-4H3;10-11,21,23,28H,4-9,12-16H2,1-3H3/t25-,27+,31-;2*23-,25+,29-;21-,23+,27-/m0000/s1
InChIKeyKTOZYFSJAVGCQS-WYGMQHFFSA-N
MW2050.65 g/mol
LogP15.28
Rot. Bonds18

About (1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one

(1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one (PubChem CID 167608928) has the molecular formula C116H160N16O17 and a molecular weight of 2050.65 g/mol. Its IUPAC name is (1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one.

Molecular Properties

Compound Name(1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one
PubChem CID167608928
Molecular FormulaC116H160N16O17
Molecular Weight2050.65 g/mol
Exact Mass2049.21
IUPAC Name(1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one
SMILESCCC(=O)[C@@H]1C[C@]23COCCCCCNCc4cc(C(C)C)cc5c(C(C)=O)nn(c45)CC(=O)N1[C@@H]2C3.CCC(=O)[C@@H]1C[C@]23COCCCCCNCc4cc(C)cc5c(C(C)=O)nn(c45)CC(=O)N1[C@@H]2C3.CCC(=O)[C@@H]1C[C@]23COCCCCCNCc4cc(CCC(C)C)cc5c(C(C)=O)nn(c45)CC(=O)N1[C@@H]2C3.CCC(=O)[C@@H]1C[C@]23COCCCCCNCc4cc(OC(C)C)cc5c(C(C)=O)nn(c45)CC(=O)N1[C@@H]2C3
InChIInChI=1S/C31H44N4O4.C29H40N4O5.C29H40N4O4.C27H36N4O4/c1-5-26(37)25-15-31-16-27(31)35(25)28(38)18-34-30-23(17-32-11-7-6-8-12-39-19-31)13-22(10-9-20(2)3)14-24(30)29(33-34)21(4)36;1-5-24(35)23-13-29-14-25(29)33(23)26(36)16-32-28-20(15-30-9-7-6-8-10-37-17-29)11-21(38-18(2)3)12-22(28)27(31-32)19(4)34;1-5-24(35)23-13-29-14-25(29)33(23)26(36)16-32-28-21(15-30-9-7-6-8-10-37-17-29)11-20(18(2)3)12-22(28)27(31-32)19(4)34;1-4-22(33)21-12-27-13-23(27)31(21)24(34)15-30-26-19(14-28-8-6-5-7-9-35-16-27)10-17(2)11-20(26)25(29-30)18(3)32/h13-14,20,25,27,32H,5-12,15-19H2,1-4H3;11-12,18,23,25,30H,5-10,13-17H2,1-4H3;11-12,18,23,25,30H,5-10,13-17H2,1-4H3;10-11,21,23,28H,4-9,12-16H2,1-3H3/t25-,27+,31-;2*23-,25+,29-;21-,23+,27-/m0000/s1
InChIKeyKTOZYFSJAVGCQS-WYGMQHFFSA-N
XLogP15.28
TPSA383.35 Ų
H-Bond Donors4
H-Bond Acceptors29
Rotatable Bonds18
Heavy Atoms149
Complexity—

Lipinski Rule of Five

3 violations

RuleValue
MW ≤ 5002050.65
LogP ≤ 515.28
H-Bond Donors ≤ 54
H-Bond Acceptors ≤ 1029

Analyze (1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one with MolForge

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Frequently Asked Questions

What is the IUPAC name of (1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one?
The IUPAC name of (1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one (CID 167608928) is (1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one.
What is the SMILES notation for (1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one?
The canonical SMILES for (1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one is CCC(=O)[C@@H]1C[C@]23COCCCCCNCc4cc(C(C)C)cc5c(C(C)=O)nn(c45)CC(=O)N1[C@@H]2C3.CCC(=O)[C@@H]1C[C@]23COCCCCCNCc4cc(C)cc5c(C(C)=O)nn(c45)CC(=O)N1[C@@H]2C3.CCC(=O)[C@@H]1C[C@]23COCCCCCNCc4cc(CCC(C)C)cc5c(C(C)=O)nn(c45)CC(=O)N1[C@@H]2C3.CCC(=O)[C@@H]1C[C@]23COCCCCCNCc4cc(OC(C)C)cc5c(C(C)=O)nn(c45)CC(=O)N1[C@@H]2C3.
What is the InChIKey of (1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one?
The InChIKey is KTOZYFSJAVGCQS-WYGMQHFFSA-N. The full InChI is InChI=1S/C31H44N4O4.C29H40N4O5.C29H40N4O4.C27H36N4O4/c1-5-26(37)25-15-31-16-27(31)35(25)28(38)18-34-30-23(17-32-11-7-6-8-12-39-19-31)13-22(10-9-20(2)3)14-24(30)29(33-34)21(4)36;1-5-24(35)23-13-29-14-25(29)33(23)26(36)16-32-28-20(15-30-9-7-6-8-10-37-17-29)11-21(38-18(2)3)12-22(28)27(31-32)19(4)34;1-5-24(35)23-13-29-14-25(29)33(23)26(36)16-32-28-21(15-30-9-7-6-8-10-37-17-29)11-20(18(2)3)12-22(28)27(31-32)19(4)34;1-4-22(33)21-12-27-13-23(27)31(21)24(34)15-30-26-19(14-28-8-6-5-7-9-35-16-27)10-17(2)11-20(26)25(29-30)18(3)32/h13-14,20,25,27,32H,5-12,15-19H2,1-4H3;11-12,18,23,25,30H,5-10,13-17H2,1-4H3;11-12,18,23,25,30H,5-10,13-17H2,1-4H3;10-11,21,23,28H,4-9,12-16H2,1-3H3/t25-,27+,31-;2*23-,25+,29-;21-,23+,27-/m0000/s1.
What are the key properties of (1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one?
(1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one has a molecular weight of 2050.65 g/mol, XLogP of 15.28, 18 rotatable bonds, 4 hydrogen bond donors, and 29 hydrogen bond acceptors.
Where does this data come from?
All data for (1S,22R,25S)-16-acetyl-13-(3-methylbutyl)-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-13-methyl-25-propanoyl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yl-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one;(1S,22R,25S)-16-acetyl-25-propanoyl-13-propan-2-yloxy-3-oxa-9,17,18,21-tetrazapentacyclo[19.2.2.111,15.01,22.018,26]hexacosa-11(26),12,14,16-tetraen-20-one is sourced from PubChem (CID 167608928), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).