(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one

C84H116Cl2N10O14S4 — CID 160564016

IUPAC(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one
SMILESCO[C@@]1(CN2CCN3CCN(S(C)(=O)=O)C[C@@H]3C2)/C=C/C[C@H](C)[C@@H](C)S(=O)(=O)NC(=O)c2ccc3c(c2)N(C[C@@H]2CC[C@H]21)C[C@@]1(CCCc2cc(Cl)ccc21)CO3.CO[C@@]1(CN2CCN3CCN(S(C)(=O)=O)C[C@H]3C2)/C=C/C[C@H](C)[C@@H](C)S(=O)(=O)NC(=O)c2ccc3c(c2)N(C[C@@H]2CC[C@H]21)C[C@@]1(CCCc2cc(Cl)ccc21)CO3
InChIInChI=1S/2C42H58ClN5O7S2/c2*1-29-7-5-16-42(54-3,27-45-17-18-46-19-20-48(56(4,50)51)25-35(46)24-45)37-12-9-33(37)23-47-26-41(15-6-8-31-21-34(43)11-13-36(31)41)28-55-39-14-10-32(22-38(39)47)40(49)44-57(52,53)30(29)2/h2*5,10-11,13-14,16,21-22,29-30,33,35,37H,6-9,12,15,17-20,23-28H2,1-4H3,(H,44,49)/b2*16-5+/t29-,30+,33-,35+,37+,41-,42+;29-,30+,33-,35-,37+,41-,42+/m00/s1
InChIKeyQZRNHYPUJUSTHQ-YLXFJGAESA-N
MW1689.08 g/mol
LogP9.06
Rot. Bonds8

About (3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one

(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one (PubChem CID 160564016) has the molecular formula C84H116Cl2N10O14S4 and a molecular weight of 1689.08 g/mol. Its IUPAC name is (3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one.

Molecular Properties

Compound Name(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one
PubChem CID160564016
Molecular FormulaC84H116Cl2N10O14S4
Molecular Weight1689.08 g/mol
Exact Mass1686.69
IUPAC Name(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one
SMILESCO[C@@]1(CN2CCN3CCN(S(C)(=O)=O)C[C@@H]3C2)/C=C/C[C@H](C)[C@@H](C)S(=O)(=O)NC(=O)c2ccc3c(c2)N(C[C@@H]2CC[C@H]21)C[C@@]1(CCCc2cc(Cl)ccc21)CO3.CO[C@@]1(CN2CCN3CCN(S(C)(=O)=O)C[C@H]3C2)/C=C/C[C@H](C)[C@@H](C)S(=O)(=O)NC(=O)c2ccc3c(c2)N(C[C@@H]2CC[C@H]21)C[C@@]1(CCCc2cc(Cl)ccc21)CO3
InChIInChI=1S/2C42H58ClN5O7S2/c2*1-29-7-5-16-42(54-3,27-45-17-18-46-19-20-48(56(4,50)51)25-35(46)24-45)37-12-9-33(37)23-47-26-41(15-6-8-31-21-34(43)11-13-36(31)41)28-55-39-14-10-32(22-38(39)47)40(49)44-57(52,53)30(29)2/h2*5,10-11,13-14,16,21-22,29-30,33,35,37H,6-9,12,15,17-20,23-28H2,1-4H3,(H,44,49)/b2*16-5+/t29-,30+,33-,35+,37+,41-,42+;29-,30+,33-,35-,37+,41-,42+/m00/s1
InChIKeyQZRNHYPUJUSTHQ-YLXFJGAESA-N
XLogP9.06
TPSA257.60 Ų
H-Bond Donors2
H-Bond Acceptors20
Rotatable Bonds8
Heavy Atoms114
Complexity

Lipinski Rule of Five

3 violations

RuleValue
MW ≤ 5001689.08
LogP ≤ 59.06
H-Bond Donors ≤ 52
H-Bond Acceptors ≤ 1020

Computed Properties (RDKit)

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

Analyze (3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one with MolForge

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Frequently Asked Questions

What is the IUPAC name of (3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one?
The IUPAC name of (3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one (CID 160564016) is (3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one.
What is the SMILES notation for (3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one?
The canonical SMILES for (3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one is CO[C@@]1(CN2CCN3CCN(S(C)(=O)=O)C[C@@H]3C2)/C=C/C[C@H](C)[C@@H](C)S(=O)(=O)NC(=O)c2ccc3c(c2)N(C[C@@H]2CC[C@H]21)C[C@@]1(CCCc2cc(Cl)ccc21)CO3.CO[C@@]1(CN2CCN3CCN(S(C)(=O)=O)C[C@H]3C2)/C=C/C[C@H](C)[C@@H](C)S(=O)(=O)NC(=O)c2ccc3c(c2)N(C[C@@H]2CC[C@H]21)C[C@@]1(CCCc2cc(Cl)ccc21)CO3.
What is the InChIKey of (3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one?
The InChIKey is QZRNHYPUJUSTHQ-YLXFJGAESA-N. The full InChI is InChI=1S/2C42H58ClN5O7S2/c2*1-29-7-5-16-42(54-3,27-45-17-18-46-19-20-48(56(4,50)51)25-35(46)24-45)37-12-9-33(37)23-47-26-41(15-6-8-31-21-34(43)11-13-36(31)41)28-55-39-14-10-32(22-38(39)47)40(49)44-57(52,53)30(29)2/h2*5,10-11,13-14,16,21-22,29-30,33,35,37H,6-9,12,15,17-20,23-28H2,1-4H3,(H,44,49)/b2*16-5+/t29-,30+,33-,35+,37+,41-,42+;29-,30+,33-,35-,37+,41-,42+/m00/s1.
What are the key properties of (3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one?
(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one has a molecular weight of 1689.08 g/mol, XLogP of 9.06, 8 rotatable bonds, 2 hydrogen bond donors, and 20 hydrogen bond acceptors.
Where does this data come from?
All data for (3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aR)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one;(3'R,4S,6'R,7'S,8'E,11'S,12'R)-7'-[[(9aS)-2-methylsulfonyl-3,4,6,7,9,9a-hexahydro-1H-pyrazino[1,2-a]pyrazin-8-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13',13'-dioxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13λ6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one is sourced from PubChem (CID 160564016), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).