17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione

C126H130N18O15S — CID 158241653

IUPAC17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione
SMILESCN1CCN(C)CCn2cc(c3ccccc32)C2=C(C(=O)NC2=O)c2cn(c3ccccc23)CC1.CN1CCOCCOCCN(C)CCn2cc(c3ccccc32)C2=C(C(=O)NC2=O)c2cn(c3ccccc23)CC1.O=C1NC(=O)C2=C1c1cn(c3ccccc13)CCOCCOCCN(Cc1ccco1)CCn1cc2c2ccccc21.O=C1NC(=O)C2=C1c1cn(c3ccccc13)CCOCCOCCN(Cc1cccs1)CCn1cc2c2ccccc21
InChIInChI=1S/C33H32N4O5.C33H32N4O4S.C32H37N5O4.C28H29N5O2/c38-32-30-26-21-36(28-9-3-1-7-24(26)28)12-11-35(20-23-6-5-15-42-23)13-16-40-18-19-41-17-14-37-22-27(31(30)33(39)34-32)25-8-2-4-10-29(25)37;38-32-30-26-21-36(28-9-3-1-7-24(26)28)12-11-35(20-23-6-5-19-42-23)13-15-40-17-18-41-16-14-37-22-27(31(30)33(39)34-32)25-8-2-4-10-29(25)37;1-34-11-13-36-21-25(23-7-3-5-9-27(23)36)29-30(32(39)33-31(29)38)26-22-37(28-10-6-4-8-24(26)28)14-12-35(2)16-18-41-20-19-40-17-15-34;1-30-11-12-31(2)14-16-33-18-22(20-8-4-6-10-24(20)33)26-25(27(34)29-28(26)35)21-17-32(15-13-30)23-9-5-3-7-19(21)23/h1-10,15,21-22H,11-14,16-20H2,(H,34,38,39);1-10,19,21-22H,11-18,20H2,(H,34,38,39);3-10,21-22H,11-20H2,1-2H3,(H,33,38,39);3-10,17-18H,11-16H2,1-2H3,(H,29,34,35)
InChIKeyGFPNHZMGKHCWPI-UHFFFAOYSA-N
MW2168.60 g/mol
LogP15.19
Rot. Bonds4

About 17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione

17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione (PubChem CID 158241653) has the molecular formula C126H130N18O15S and a molecular weight of 2168.60 g/mol. Its IUPAC name is 17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione.

Molecular Properties

Compound Name17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione
PubChem CID158241653
Molecular FormulaC126H130N18O15S
Molecular Weight2168.60 g/mol
Exact Mass2166.97
IUPAC Name17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione
SMILESCN1CCN(C)CCn2cc(c3ccccc32)C2=C(C(=O)NC2=O)c2cn(c3ccccc23)CC1.CN1CCOCCOCCN(C)CCn2cc(c3ccccc32)C2=C(C(=O)NC2=O)c2cn(c3ccccc23)CC1.O=C1NC(=O)C2=C1c1cn(c3ccccc13)CCOCCOCCN(Cc1ccco1)CCn1cc2c2ccccc21.O=C1NC(=O)C2=C1c1cn(c3ccccc13)CCOCCOCCN(Cc1cccs1)CCn1cc2c2ccccc21
InChIInChI=1S/C33H32N4O5.C33H32N4O4S.C32H37N5O4.C28H29N5O2/c38-32-30-26-21-36(28-9-3-1-7-24(26)28)12-11-35(20-23-6-5-15-42-23)13-16-40-18-19-41-17-14-37-22-27(31(30)33(39)34-32)25-8-2-4-10-29(25)37;38-32-30-26-21-36(28-9-3-1-7-24(26)28)12-11-35(20-23-6-5-19-42-23)13-15-40-17-18-41-16-14-37-22-27(31(30)33(39)34-32)25-8-2-4-10-29(25)37;1-34-11-13-36-21-25(23-7-3-5-9-27(23)36)29-30(32(39)33-31(29)38)26-22-37(28-10-6-4-8-24(26)28)14-12-35(2)16-18-41-20-19-40-17-15-34;1-30-11-12-31(2)14-16-33-18-22(20-8-4-6-10-24(20)33)26-25(27(34)29-28(26)35)21-17-32(15-13-30)23-9-5-3-7-19(21)23/h1-10,15,21-22H,11-14,16-20H2,(H,34,38,39);1-10,19,21-22H,11-18,20H2,(H,34,38,39);3-10,21-22H,11-20H2,1-2H3,(H,33,38,39);3-10,17-18H,11-16H2,1-2H3,(H,29,34,35)
InChIKeyGFPNHZMGKHCWPI-UHFFFAOYSA-N
XLogP15.19
TPSA312.08 Ų
H-Bond Donors4
H-Bond Acceptors30
Rotatable Bonds4
Heavy Atoms160
Complexity

Lipinski Rule of Five

3 violations

RuleValue
MW ≤ 5002168.60
LogP ≤ 515.19
H-Bond Donors ≤ 54
H-Bond Acceptors ≤ 1030

Computed Properties (RDKit)

Structural Alerts{'alert_name': 'phthalimide', 'substructure': 'N/A'}

Analyze 17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione with MolForge

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Related Compounds

Frequently Asked Questions

What is the IUPAC name of 17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione?
The IUPAC name of 17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione (CID 158241653) is 17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione.
What is the SMILES notation for 17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione?
The canonical SMILES for 17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione is CN1CCN(C)CCn2cc(c3ccccc32)C2=C(C(=O)NC2=O)c2cn(c3ccccc23)CC1.CN1CCOCCOCCN(C)CCn2cc(c3ccccc32)C2=C(C(=O)NC2=O)c2cn(c3ccccc23)CC1.O=C1NC(=O)C2=C1c1cn(c3ccccc13)CCOCCOCCN(Cc1ccco1)CCn1cc2c2ccccc21.O=C1NC(=O)C2=C1c1cn(c3ccccc13)CCOCCOCCN(Cc1cccs1)CCn1cc2c2ccccc21.
What is the InChIKey of 17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione?
The InChIKey is GFPNHZMGKHCWPI-UHFFFAOYSA-N. The full InChI is InChI=1S/C33H32N4O5.C33H32N4O4S.C32H37N5O4.C28H29N5O2/c38-32-30-26-21-36(28-9-3-1-7-24(26)28)12-11-35(20-23-6-5-15-42-23)13-16-40-18-19-41-17-14-37-22-27(31(30)33(39)34-32)25-8-2-4-10-29(25)37;38-32-30-26-21-36(28-9-3-1-7-24(26)28)12-11-35(20-23-6-5-19-42-23)13-15-40-17-18-41-16-14-37-22-27(31(30)33(39)34-32)25-8-2-4-10-29(25)37;1-34-11-13-36-21-25(23-7-3-5-9-27(23)36)29-30(32(39)33-31(29)38)26-22-37(28-10-6-4-8-24(26)28)14-12-35(2)16-18-41-20-19-40-17-15-34;1-30-11-12-31(2)14-16-33-18-22(20-8-4-6-10-24(20)33)26-25(27(34)29-28(26)35)21-17-32(15-13-30)23-9-5-3-7-19(21)23/h1-10,15,21-22H,11-14,16-20H2,(H,34,38,39);1-10,19,21-22H,11-18,20H2,(H,34,38,39);3-10,21-22H,11-20H2,1-2H3,(H,33,38,39);3-10,17-18H,11-16H2,1-2H3,(H,29,34,35).
What are the key properties of 17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione?
17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione has a molecular weight of 2168.60 g/mol, XLogP of 15.19, 4 rotatable bonds, 4 hydrogen bond donors, and 30 hydrogen bond acceptors.
Where does this data come from?
All data for 17,26-dimethyl-20,23-dioxa-4,14,17,26,29-pentazahexacyclo[27.6.1.17,14.02,6.08,13.030,35]heptatriaconta-1(36),2(6),7(37),8,10,12,30,32,34-nonaene-3,5-dione;17,20-dimethyl-4,14,17,20,23-pentazahexacyclo[21.6.1.17,14.02,6.08,13.024,29]hentriaconta-1(30),2(6),7(31),8,10,12,24,26,28-nonaene-3,5-dione;23-(furan-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione;23-(thiophen-2-ylmethyl)-17,20-dioxa-4,14,23,26-tetrazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8,10,12,27,29,31-nonaene-3,5-dione is sourced from PubChem (CID 158241653), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).