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    中文名称 英文名称 CAS号 化学式 结构式图片
    —— 9-Chloro-4,6-dihydroxy-10-methyl-10-(4-methylpent-3-enyl)-13-propan-2-ylidenetetracyclo[7.5.1.01,11.02,7]pentadeca-2(7),3,5-triene-8,15-dione —— C25H29ClO4
    9-Chloro-4,6-dihydroxy-10-methyl-10-(4-methylpent-3-enyl)-13-propan-2-ylidenetetracyclo[7.5.1.01,11.02,7]pentadeca-2(7),3,5-triene-8,15-dione
    —— [9-Acetyloxy-13-hydroxy-3,6,6,10,14-pentamethyl-8-(2-methylpropoxy)-2-oxo-16-oxatetracyclo[10.3.1.01,12.05,7]hexadec-10-en-4-yl] acetate —— C28H42O8
    [9-Acetyloxy-13-hydroxy-3,6,6,10,14-pentamethyl-8-(2-methylpropoxy)-2-oxo-16-oxatetracyclo[10.3.1.01,12.05,7]hexadec-10-en-4-yl] acetate
    —— 9-(2-Ethoxy-3-methoxyphenyl)-2-methyl-4-(3-phenylpropyl)-4,7,17-triazatetracyclo[8.7.0.02,7.011,16]heptadeca-1(10),11,13,15-tetraene-3,6-dione —— C33H35N3O4
    9-(2-Ethoxy-3-methoxyphenyl)-2-methyl-4-(3-phenylpropyl)-4,7,17-triazatetracyclo[8.7.0.02,7.011,16]heptadeca-1(10),11,13,15-tetraene-3,6-dione
    —— 9-(6-hydroxy-5,5-dimethylhex-2-en-2-yl)-5,6,6a,7,8,9,9a,9b-octahydro-1H-azuleno[4,5-c]furan-3-one —— C20H30O3
    9-(6-hydroxy-5,5-dimethylhex-2-en-2-yl)-5,6,6a,7,8,9,9a,9b-octahydro-1H-azuleno[4,5-c]furan-3-one
    —— 9-Formyl-10,11,13-trihydroxy-2-methoxycarbonyl-2,6a,6b,9,12a-pentamethyl-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylic acid —— C31H46O8
    9-Formyl-10,11,13-trihydroxy-2-methoxycarbonyl-2,6a,6b,9,12a-pentamethyl-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylic acid
    —— 9-(Cyclopropylmethyl)-12-(pyrazine-2-carbonyl)-2-oxa-9,12-diazatricyclo[9.2.1.03,8]tetradeca-3,5,7-trien-10-one —— C20H20N4O3
    9-(Cyclopropylmethyl)-12-(pyrazine-2-carbonyl)-2-oxa-9,12-diazatricyclo[9.2.1.03,8]tetradeca-3,5,7-trien-10-one
    —— 9-Hydroxy-2,11,12-trimethoxy-1,2,8,9-tetrahydroindolo[7a,1-a]isoquinolin-6-one —— C19H21NO5
    9-Hydroxy-2,11,12-trimethoxy-1,2,8,9-tetrahydroindolo[7a,1-a]isoquinolin-6-one
    —— 9,17-Dihydroxy-5,11,15,16,16-pentamethyl-6,14-dioxa-4-azapentacyclo[10.6.1.03,7.08,19.013,17]nonadeca-1(19),3(7),4,8,10,12-hexaene-2,18-dione —— C21H19NO6
    9,17-Dihydroxy-5,11,15,16,16-pentamethyl-6,14-dioxa-4-azapentacyclo[10.6.1.03,7.08,19.013,17]nonadeca-1(19),3(7),4,8,10,12-hexaene-2,18-dione
    —— 9-Hydroxy-3-methyl-23-[[6,8,16-trihydroxy-7-[(4-hydroxy-3,5-dimethoxyphenyl)methyl]-2-(2-hydroxyethyl)-10-(hydroxymethoxy)-3,4-dithiabicyclo[11.4.0]heptadeca-1(17),13,15-trien-15-yl]oxy]-16,17-dithia-12,30-diazahexacyclo[17.6.5.27,25.01,6.010,14.020,25]dotriacont-26-yn-13-one —— C56H80N2O12S4
    9-Hydroxy-3-methyl-23-[[6,8,16-trihydroxy-7-[(4-hydroxy-3,5-dimethoxyphenyl)methyl]-2-(2-hydroxyethyl)-10-(hydroxymethoxy)-3,4-dithiabicyclo[11.4.0]heptadeca-1(17),13,15-trien-15-yl]oxy]-16,17-dithia-12,30-diazahexacyclo[17.6.5.27,25.01,6.010,14.020,25]dotriacont-26-yn-13-one
    —— 9-(Furan-2-yl)-2-(furan-2-ylmethylidene)-8,9-dihydrofuro[2,3-f]chromene-3,7-dione —— C20H12O6
    9-(Furan-2-yl)-2-(furan-2-ylmethylidene)-8,9-dihydrofuro[2,3-f]chromene-3,7-dione
    —— 9-(4-Bromophenyl)-4-(2-methoxyethyl)-2-methyl-4,7,17-triazatetracyclo[8.7.0.02,7.011,16]heptadeca-1(10),11,13,15-tetraene-3,6-dione —— C24H24BrN3O3
    9-(4-Bromophenyl)-4-(2-methoxyethyl)-2-methyl-4,7,17-triazatetracyclo[8.7.0.02,7.011,16]heptadeca-1(10),11,13,15-tetraene-3,6-dione
    —— 9-[[15-[[1-[15-[Carboxy(hydroxy)methyl]-20,24,28,30-tetrahydroxy-19,23,25,27,29,34-hexamethyl-13,16-dioxo-17,36-dioxa-14-azabicyclo[30.3.1]hexatriaconta-3,5,9,11,22,26-hexaen-18-yl]-2-hydroxypropyl]amino]-3,5,9,13-tetrahydroxy-2,6,8,10,14-pentamethyl-15-oxopentadec-7-en-4-yl]amino]-3-hydroxy-2,2,4,6,6-pentamethyl-5,9-dioxonon-7-enoic acid —— C78H127N3O22
    9-[[15-[[1-[15-[Carboxy(hydroxy)methyl]-20,24,28,30-tetrahydroxy-19,23,25,27,29,34-hexamethyl-13,16-dioxo-17,36-dioxa-14-azabicyclo[30.3.1]hexatriaconta-3,5,9,11,22,26-hexaen-18-yl]-2-hydroxypropyl]amino]-3,5,9,13-tetrahydroxy-2,6,8,10,14-pentamethyl-15-oxopentadec-7-en-4-yl]amino]-3-hydroxy-2,2,4,6,6-pentamethyl-5,9-dioxonon-7-enoic acid
    —— 9-(Pyridin-2-ylmethyl)-12-[4-(trifluoromethyl)benzoyl]-2-oxa-9,12-diazatricyclo[9.2.1.03,8]tetradeca-3,5,7-trien-10-one —— C25H20F3N3O3
    9-(Pyridin-2-ylmethyl)-12-[4-(trifluoromethyl)benzoyl]-2-oxa-9,12-diazatricyclo[9.2.1.03,8]tetradeca-3,5,7-trien-10-one
    —— 9-(4-Hydroxy-3,5-dimethoxyphenyl)-2-[(2-methoxyphenyl)methylidene]-8,9-dihydrofuro[2,3-f]chromene-3,7-dione —— C27H22O8
    9-(4-Hydroxy-3,5-dimethoxyphenyl)-2-[(2-methoxyphenyl)methylidene]-8,9-dihydrofuro[2,3-f]chromene-3,7-dione
    —— 9,12-octadecadienal 26537-70-2 C18H32O
    9,12-octadecadienal
    —— 9,10-dimethoxy-2-(octan-2-ylamino)-6,7-dihydro-4H-pyrimido[6,1-a]isoquinolin-4-one —— C22H31N3O3
    9,10-dimethoxy-2-(octan-2-ylamino)-6,7-dihydro-4H-pyrimido[6,1-a]isoquinolin-4-one
    —— 9-(1,6-dihydroxyhexa-2,4-dienylidene)-4,4a,8-trihydroxy-2-(6-hydroxyhex-4-enoyl)-4,5a,7,9b-tetramethyl-3,9a-dihydro-2H-dibenzofuran-1,6-dione —— C28H36O10
    9-(1,6-dihydroxyhexa-2,4-dienylidene)-4,4a,8-trihydroxy-2-(6-hydroxyhex-4-enoyl)-4,5a,7,9b-tetramethyl-3,9a-dihydro-2H-dibenzofuran-1,6-dione
    —— (9-Acetyloxy-5,7,7,11-tetramethyl-4-oxo-6-tricyclo[6.3.0.01,5]undec-2-enyl) 2-methylbut-2-enoate —— C22H30O5
    (9-Acetyloxy-5,7,7,11-tetramethyl-4-oxo-6-tricyclo[6.3.0.01,5]undec-2-enyl) 2-methylbut-2-enoate
    —— 9-(3-Methoxy-4-propoxyphenyl)-2-methyl-4-(oxolan-2-ylmethyl)-4,7,17-triazatetracyclo[8.7.0.02,7.011,16]heptadeca-1(10),11,13,15-tetraene-3,6-dione —— C30H35N3O5
    9-(3-Methoxy-4-propoxyphenyl)-2-methyl-4-(oxolan-2-ylmethyl)-4,7,17-triazatetracyclo[8.7.0.02,7.011,16]heptadeca-1(10),11,13,15-tetraene-3,6-dione
    —— [9-(chloromethyl)-9-hydroxy-3,6-dimethylidene-2,8-dioxo-4,5,6a,7,9a,9b-hexahydro-3aH-azuleno[4,5-b]furan-4-yl] 2-(hydroxymethyl)prop-2-enoate —— C19H21ClO7
    [9-(chloromethyl)-9-hydroxy-3,6-dimethylidene-2,8-dioxo-4,5,6a,7,9a,9b-hexahydro-3aH-azuleno[4,5-b]furan-4-yl] 2-(hydroxymethyl)prop-2-enoate
    —— 9-[3,4-bis(hydroxymethyl)oxetan-2-yl]-3H-purine-2,6-dione —— C10H12N4O5
    9-[3,4-bis(hydroxymethyl)oxetan-2-yl]-3H-purine-2,6-dione
    —— (9,13-Dimethyl-3-methylidene-12-oxo-6-propan-2-yl-15-oxatricyclo[6.6.1.02,7]pentadecan-9-yl) acetate —— C22H34O4
    (9,13-Dimethyl-3-methylidene-12-oxo-6-propan-2-yl-15-oxatricyclo[6.6.1.02,7]pentadecan-9-yl) acetate
    —— 9beta,19-Cyclolanost-25-en-3beta-ol —— C30H50O
    9beta,19-Cyclolanost-25-en-3beta-ol
    —— 9-(1,3-benzodioxol-5-yl)-3-(piperidine-4-carbonyl)-2,4,4a,6-tetrahydro-1H-pyrazino[2,1-c][1,4]benzodiazepine-5,11-dione —— C25H26N4O5
    9-(1,3-benzodioxol-5-yl)-3-(piperidine-4-carbonyl)-2,4,4a,6-tetrahydro-1H-pyrazino[2,1-c][1,4]benzodiazepine-5,11-dione
    —— 9-(1,3-dimethyl-2-oxo-2,3-dihydro-1H-benzimidazol-5-yl)-2-(propan-2-ylidene)-8,9-dihydro-7H-furo[2,3-f]chromene-3,7(2H)-dione —— C23H20N2O5
    9-(1,3-dimethyl-2-oxo-2,3-dihydro-1H-benzimidazol-5-yl)-2-(propan-2-ylidene)-8,9-dihydro-7H-furo[2,3-f]chromene-3,7(2H)-dione
    —— 9-Methoxy-6-(2-methoxycarbonyl-2,4-dimethyl-3,5-dioxoheptyl)phenazine-1-carboxylic acid —— C25H26N2O7
    9-Methoxy-6-(2-methoxycarbonyl-2,4-dimethyl-3,5-dioxoheptyl)phenazine-1-carboxylic acid
    —— 9-Acetyl-5-chloro-3-(3,5-dimethylhepta-1,3-dienyl)-8-methoxy-6a,8-dimethyl-9,9a-dihydrofuro[2,3-h]isochromen-6-one —— C25H31ClO5
    9-Acetyl-5-chloro-3-(3,5-dimethylhepta-1,3-dienyl)-8-methoxy-6a,8-dimethyl-9,9a-dihydrofuro[2,3-h]isochromen-6-one
    —— [9-amino-6'-[5-hydroxy-2-(hydroxymethyl)pentyl]-15-(hydroxymethyl)-14-methyl-28-(methylamino)-4,7',24-trioxospiro[19,20-dithia-3,8-diazahexacyclo[21.4.1.02,21.03,27.06,11.012,17]octacosa-6(11),9,16,25-tetraene-13,2'-3H-furo[3,2-g]chromene]-14-yl] 2-(2-hydroxyethyl)but-2-enoate —— C49H60N4O11S2
    [9-amino-6'-[5-hydroxy-2-(hydroxymethyl)pentyl]-15-(hydroxymethyl)-14-methyl-28-(methylamino)-4,7',24-trioxospiro[19,20-dithia-3,8-diazahexacyclo[21.4.1.02,21.03,27.06,11.012,17]octacosa-6(11),9,16,25-tetraene-13,2'-3H-furo[3,2-g]chromene]-14-yl] 2-(2-hydroxyethyl)but-2-enoate
    —— 9-ethyl-4,6,9,10,11-pentahydroxy-7-[4-hydroxy-5-[4-hydroxy-5-(5-hydroxy-6-methyloxan-2-yl)oxy-6-methyloxan-2-yl]oxy-6-methyloxan-2-yl]oxy-7,8,10,11a-tetrahydro-5aH-tetracene-5,12-dione —— C38H50O16
    9-ethyl-4,6,9,10,11-pentahydroxy-7-[4-hydroxy-5-[4-hydroxy-5-(5-hydroxy-6-methyloxan-2-yl)oxy-6-methyloxan-2-yl]oxy-6-methyloxan-2-yl]oxy-7,8,10,11a-tetrahydro-5aH-tetracene-5,12-dione
    —— 9-(6,7-Dihydroxy-3,7-dimethyloct-2-enoxy)furo[3,2-g]chromen-7-one —— C21H24O6
    9-(6,7-Dihydroxy-3,7-dimethyloct-2-enoxy)furo[3,2-g]chromen-7-one
    —— [9-hydroxy-8a-(hydroxymethyl)-4,4,6a,6b,11,12,14b-heptamethyl-2,3,4a,5,6,7,8,9,10,11,12,12a,14,14a-tetradecahydro-1H-picen-3-yl] 3-(3,4-dihydroxyphenyl)prop-2-enoate —— C39H56O6
    [9-hydroxy-8a-(hydroxymethyl)-4,4,6a,6b,11,12,14b-heptamethyl-2,3,4a,5,6,7,8,9,10,11,12,12a,14,14a-tetradecahydro-1H-picen-3-yl] 3-(3,4-dihydroxyphenyl)prop-2-enoate
    —— [9-(3,4-Dihydroxy-5-methoxyphenyl)-24-(3-hydroxyphenyl)-7-oxo-18-(3-oxobutyl)-10,18,20,28-tetrazaoctacyclo[23.13.3.110,13.119,23.02,31.02,35.012,17.026,30]tritetraconta-1(38),11,13(43),14,16,19(42),22,26,29,32,36-undecaen-40-yn-5-yl] acetate —— C58H58N4O8
    [9-(3,4-Dihydroxy-5-methoxyphenyl)-24-(3-hydroxyphenyl)-7-oxo-18-(3-oxobutyl)-10,18,20,28-tetrazaoctacyclo[23.13.3.110,13.119,23.02,31.02,35.012,17.026,30]tritetraconta-1(38),11,13(43),14,16,19(42),22,26,29,32,36-undecaen-40-yn-5-yl] acetate
    —— (9-methyl-3-methylidene-2-oxospiro[4,5,6a,7,9a,9b-hexahydro-3aH-azuleno[4,5-b]furan-6,2'-oxirane]-4-yl) 4-hydroxy-2-(hydroxymethyl)but-2-enoate —— C20H24O7
    (9-methyl-3-methylidene-2-oxospiro[4,5,6a,7,9a,9b-hexahydro-3aH-azuleno[4,5-b]furan-6,2'-oxirane]-4-yl) 4-hydroxy-2-(hydroxymethyl)but-2-enoate
    —— 9-Methoxy-11,11b-dimethyl-1,2,5,6-tetrahydrobenzo[a]carbazole-3,3-dithiol —— C19H23NOS2
    9-Methoxy-11,11b-dimethyl-1,2,5,6-tetrahydrobenzo[a]carbazole-3,3-dithiol
    —— (9,15-Dimethoxy-5,7,17-trioxa-12-azahexacyclo[10.6.2.01,13.02,10.04,8.016,18]icosa-2,4(8),9-trien-19-yl) acetate —— C20H23NO7
    (9,15-Dimethoxy-5,7,17-trioxa-12-azahexacyclo[10.6.2.01,13.02,10.04,8.016,18]icosa-2,4(8),9-trien-19-yl) acetate
    —— [9-Amino-5-[2-[2-(ethylamino)phenyl]ethyl]-17,31-dihydroxy-29-(hydroxymethoxy)-18-methoxy-22-oxa-10-azaoctacyclo[21.11.1.11,4.121,24.06,11.015,20.027,35.028,33]heptatriaconta-6(11),7,9,15,17,19,23,25,27(35),28(33),29,31-dodecaen-12-yn-36-yl]methyl acetate —— C50H51N3O8
    [9-Amino-5-[2-[2-(ethylamino)phenyl]ethyl]-17,31-dihydroxy-29-(hydroxymethoxy)-18-methoxy-22-oxa-10-azaoctacyclo[21.11.1.11,4.121,24.06,11.015,20.027,35.028,33]heptatriaconta-6(11),7,9,15,17,19,23,25,27(35),28(33),29,31-dodecaen-12-yn-36-yl]methyl acetate
    —— 9-Methyl-1,2,3,5,6,7-hexahydro[1,4]diazepino[3,2,1-jk]carbazol-6-ol —— C16H18N2O
    9-Methyl-1,2,3,5,6,7-hexahydro[1,4]diazepino[3,2,1-jk]carbazol-6-ol
    —— 9-hydroxy-2-[1-hydroxy-3-[1-hydroxy-2-[[5-(3-hydroxyphenyl)-1H-pyrrol-2-yl]methyl]-4-(1H-pyrrol-3-ylmethyl)cyclopentyl]propyl]hexadecanoic acid —— C40H60N2O6
    9-hydroxy-2-[1-hydroxy-3-[1-hydroxy-2-[[5-(3-hydroxyphenyl)-1H-pyrrol-2-yl]methyl]-4-(1H-pyrrol-3-ylmethyl)cyclopentyl]propyl]hexadecanoic acid
    —— 9-[(3,5-diacetyloxy-4-hydroxy-6-methyloxan-2-yl)oxymethyl]-10,12-dihydroxy-2,4a,6a,6b,12a-pentamethyl-3,4,5,6,6a,7,8,8a,9,10,11,12,13,14b-tetradecahydro-1H-picene-2-carboxylic acid —— C39H60O11
    9-[(3,5-diacetyloxy-4-hydroxy-6-methyloxan-2-yl)oxymethyl]-10,12-dihydroxy-2,4a,6a,6b,12a-pentamethyl-3,4,5,6,6a,7,8,8a,9,10,11,12,13,14b-tetradecahydro-1H-picene-2-carboxylic acid
    —— 9-(2,4-Difluorophenyl)-4-phenyl-8,10-dihydropyrano[2,3-f][1,3]benzoxazin-2-one —— C23H15F2NO3
    9-(2,4-Difluorophenyl)-4-phenyl-8,10-dihydropyrano[2,3-f][1,3]benzoxazin-2-one
    —— 9-(Cyclopropylmethyl)-14-methyl-4-oxa-2,9-diazatricyclo[9.4.0.02,6]pentadeca-1(11),12,14-trien-3-one —— C17H22N2O2
    9-(Cyclopropylmethyl)-14-methyl-4-oxa-2,9-diazatricyclo[9.4.0.02,6]pentadeca-1(11),12,14-trien-3-one
    —— [9,15-Diacetyloxy-7-bromo-10-hydroxy-14-(iodomethyl)-4,8,12,14-tetramethyl-13-oxatetracyclo[10.2.2.02,11.03,8]hexadecan-5-yl] acetate —— C26H38BrIO8
    [9,15-Diacetyloxy-7-bromo-10-hydroxy-14-(iodomethyl)-4,8,12,14-tetramethyl-13-oxatetracyclo[10.2.2.02,11.03,8]hexadecan-5-yl] acetate
    —— [9-Amino-21-benzyl-17,46-dihydroxy-44-(hydroxymethoxy)-19,37-dioxa-22,23-dithia-10,30-diazaundecacyclo[36.11.1.11,4.125,29.136,39.06,11.015,35.018,34.020,31.042,50.043,48]tripentaconta-6(11),7,15,17,32,34,38,40,42(50),43(48),44,46-dodecaen-12-yn-51-yl]methyl acetate —— C58H61N3O8S2
    [9-Amino-21-benzyl-17,46-dihydroxy-44-(hydroxymethoxy)-19,37-dioxa-22,23-dithia-10,30-diazaundecacyclo[36.11.1.11,4.125,29.136,39.06,11.015,35.018,34.020,31.042,50.043,48]tripentaconta-6(11),7,15,17,32,34,38,40,42(50),43(48),44,46-dodecaen-12-yn-51-yl]methyl acetate
    —— (9,10,14-Trihydroxy-5,9,14-trimethyl-4-oxo-3,12-dioxatetracyclo[8.4.0.02,6.011,13]tetradecan-7-yl) acetate —— C17H24O8
    (9,10,14-Trihydroxy-5,9,14-trimethyl-4-oxo-3,12-dioxatetracyclo[8.4.0.02,6.011,13]tetradecan-7-yl) acetate
    —— 9-(4-Bromophenyl)-2-methyl-4-(3-phenylpropyl)-4,7,17-triazatetracyclo[8.7.0.02,7.011,16]heptadeca-1(10),11,13,15-tetraene-3,6-dione —— C30H28BrN3O2
    9-(4-Bromophenyl)-2-methyl-4-(3-phenylpropyl)-4,7,17-triazatetracyclo[8.7.0.02,7.011,16]heptadeca-1(10),11,13,15-tetraene-3,6-dione
    —— 9-(6-methoxy-4-oxo-4H-chromen-3-yl)-2-(propan-2-ylidene)-8,9-dihydro-2H-furo[2,3-f]chromene-3,7-dione —— C24H18O7
    9-(6-methoxy-4-oxo-4H-chromen-3-yl)-2-(propan-2-ylidene)-8,9-dihydro-2H-furo[2,3-f]chromene-3,7-dione
    —— 9-(Cyclopentanecarbonyl)-14-methyl-4-oxa-2,9-diazatricyclo[9.4.0.02,6]pentadeca-1(11),12,14-trien-3-one —— C19H24N2O3
    9-(Cyclopentanecarbonyl)-14-methyl-4-oxa-2,9-diazatricyclo[9.4.0.02,6]pentadeca-1(11),12,14-trien-3-one
    —— 9-Methoxy-10-(3-methylbut-2-enyl)-6,6b,10a,11a-tetrahydro-[1]benzofuro[3,2-c]chromene-3,6a-diol —— C21H24O5
    9-Methoxy-10-(3-methylbut-2-enyl)-6,6b,10a,11a-tetrahydro-[1]benzofuro[3,2-c]chromene-3,6a-diol
    —— 9-hydroxy-10-[4-[[2-hydroxy-2-(2-hydroxy-5,6-dimethyl-4-methylideneoxan-2-yl)acetyl]amino]-8-methoxy-7,7-dimethyl-4a,6,8,8a-tetrahydro-4H-pyrano[3,2-d][1,3]dioxin-6-yl]deca-2,4-dienoic acid —— C30H47NO11
    9-hydroxy-10-[4-[[2-hydroxy-2-(2-hydroxy-5,6-dimethyl-4-methylideneoxan-2-yl)acetyl]amino]-8-methoxy-7,7-dimethyl-4a,6,8,8a-tetrahydro-4H-pyrano[3,2-d][1,3]dioxin-6-yl]deca-2,4-dienoic acid
    —— 9-cyclohexyl-2-(propan-2-ylidene)-8,9-dihydro-2H-furo[2,3-f]chromene-3,7-dione —— C20H22O4
    9-cyclohexyl-2-(propan-2-ylidene)-8,9-dihydro-2H-furo[2,3-f]chromene-3,7-dione