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苯并恶唑啉

中文名称 英文名称 CAS号 化学式 结构式图片
—— 2-acetyl-5-tert-butyl-4-[2-(3-butyl-1,3-benzoxazol-2-ylidene)ethenyl]-1H-pyrazol-3-one —— C22H27N3O3
2-acetyl-5-tert-butyl-4-[2-(3-butyl-1,3-benzoxazol-2-ylidene)ethenyl]-1H-pyrazol-3-one
—— (6Z)-3-[(3-bromo-4-methoxyphenyl)methylideneamino]-6-(6-methyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one —— C22H17BrN2O3
(6Z)-3-[(3-bromo-4-methoxyphenyl)methylideneamino]-6-(6-methyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one
—— 3,4,5-triethoxy-N-[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-5-methyl-4-oxocyclohexa-1,5-dien-1-yl]carbamothioyl]benzamide —— C30H33N3O6S
3,4,5-triethoxy-N-[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-5-methyl-4-oxocyclohexa-1,5-dien-1-yl]carbamothioyl]benzamide
—— (6E)-4-[(4-chloro-3-nitrophenyl)methylideneamino]-6-(6-methyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one —— C21H14ClN3O4
(6E)-4-[(4-chloro-3-nitrophenyl)methylideneamino]-6-(6-methyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one
—— (6E)-6-(6-methyl-3H-1,3-benzoxazol-2-ylidene)-4-[(4-phenylmethoxyphenyl)methylideneamino]cyclohexa-2,4-dien-1-one —— C28H22N2O3
(6E)-6-(6-methyl-3H-1,3-benzoxazol-2-ylidene)-4-[(4-phenylmethoxyphenyl)methylideneamino]cyclohexa-2,4-dien-1-one
—— [(2Z)-2-[(E)-4-(4,6-dioxo-1,3-dipropyl-2-sulfanylidene-1,3-diazinan-5-ylidene)but-2-enylidene]-1,3-benzoxazol-3-yl]methanesulfonate;ethene —— C24H28N3O6S2-
[(2Z)-2-[(E)-4-(4,6-dioxo-1,3-dipropyl-2-sulfanylidene-1,3-diazinan-5-ylidene)but-2-enylidene]-1,3-benzoxazol-3-yl]methanesulfonate;ethene
—— 4-[5-Chloro-2-[3-[6-chloro-1-ethyl-3-(2,2,3,3-tetrafluoropropyl)-5-(trifluoromethyl)benzimidazol-3-ium-2-yl]prop-2-enylidene]-6-cyano-3-ethylbenzimidazol-1-yl]butane-1-sulfonate;3-[2-[2-[(3,5-diphenyl-1,3-benzoxazol-2-ylidene)methyl]but-1-enyl]-5-phenyl-1,3-benzoxazol-3-ium-3-yl]propane-1-sulfonate —— C70H62Cl2F7N7O8S2
4-[5-Chloro-2-[3-[6-chloro-1-ethyl-3-(2,2,3,3-tetrafluoropropyl)-5-(trifluoromethyl)benzimidazol-3-ium-2-yl]prop-2-enylidene]-6-cyano-3-ethylbenzimidazol-1-yl]butane-1-sulfonate;3-[2-[2-[(3,5-diphenyl-1,3-benzoxazol-2-ylidene)methyl]but-1-enyl]-5-phenyl-1,3-benzoxazol-3-ium-3-yl]propane-1-sulfonate
—— (2Z)-2-(3H-1,3-benzoxazol-2-ylidene)-3-oxopropanenitrile —— C10H6N2O2
(2Z)-2-(3H-1,3-benzoxazol-2-ylidene)-3-oxopropanenitrile
—— 3,4,5-trimethoxy-N-[(4Z)-4-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-3-oxocyclohexa-1,5-dien-1-yl]benzamide —— C24H22N2O6
3,4,5-trimethoxy-N-[(4Z)-4-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-3-oxocyclohexa-1,5-dien-1-yl]benzamide
—— (6Z)-4-amino-6-(6-methyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one —— C14H12N2O2
(6Z)-4-amino-6-(6-methyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one
—— N-[(3E)-3-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]-2-(4-methylphenoxy)acetamide —— C23H20N2O4
N-[(3E)-3-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]-2-(4-methylphenoxy)acetamide
—— Trimethyl-[3-[[4-[(3-methyl-1,3-benzoxazol-2-ylidene)methyl]-1-phenylpyridin-1-ium-2-yl]-[3-(trimethylazaniumyl)propyl]amino]propyl]azanium —— C32H46N5O+3
Trimethyl-[3-[[4-[(3-methyl-1,3-benzoxazol-2-ylidene)methyl]-1-phenylpyridin-1-ium-2-yl]-[3-(trimethylazaniumyl)propyl]amino]propyl]azanium
—— N-[(3E)-3-(5-chloro-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]-2-methoxybenzamide —— C21H15ClN2O4
N-[(3E)-3-(5-chloro-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]-2-methoxybenzamide
—— N-[(3E)-3-(5-chloro-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]-4-propoxybenzamide —— C23H19ClN2O4
N-[(3E)-3-(5-chloro-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]-4-propoxybenzamide
—— (6E)-3-[[(E)-3-(2,4-dichlorophenyl)prop-2-enylidene]amino]-6-(6-methyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one —— C23H16Cl2N2O2
(6E)-3-[[(E)-3-(2,4-dichlorophenyl)prop-2-enylidene]amino]-6-(6-methyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one
—— N-[(3E)-3-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]-2-(3-methylphenoxy)acetamide —— C23H20N2O4
N-[(3E)-3-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]-2-(3-methylphenoxy)acetamide
—— N-[(3E)-3-(5,6-dimethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]-3-methyl-4-nitrobenzamide —— C23H19N3O5
N-[(3E)-3-(5,6-dimethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]-3-methyl-4-nitrobenzamide
—— (5Z)-5-[(2Z)-2-(3-ethyl-1,3-benzoxazol-2(3H)-ylidene)ethylidene]-3-methyl-2-thioxo-1,3-thiazolidin-4-one —— C15H14N2O2S2
(5Z)-5-[(2Z)-2-(3-ethyl-1,3-benzoxazol-2(3H)-ylidene)ethylidene]-3-methyl-2-thioxo-1,3-thiazolidin-4-one
—— (5Z)-5-[(2Z)-2-(3-ethyl-1,3-benzoxazol-2(3H)-ylidene)ethylidene]-3-phenyl-2-thioxo-1,3-thiazolidin-4-one —— C20H16N2O2S2
(5Z)-5-[(2Z)-2-(3-ethyl-1,3-benzoxazol-2(3H)-ylidene)ethylidene]-3-phenyl-2-thioxo-1,3-thiazolidin-4-one
—— (6Z)-4-[[(E)-3-(1,3-benzodioxol-5-yl)prop-2-enylidene]amino]-6-(5-methyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one —— C24H18N2O4
(6Z)-4-[[(E)-3-(1,3-benzodioxol-5-yl)prop-2-enylidene]amino]-6-(5-methyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one
—— (6Z)-2-methyl-6-[[[(3E)-3-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one —— C22H18N2O3
(6Z)-2-methyl-6-[[[(3E)-3-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one
—— (6Z)-6-[[[(4E)-4-(3H-1,3-benzoxazol-2-ylidene)-3-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-methylcyclohexa-2,4-dien-1-one —— C21H16N2O3
(6Z)-6-[[[(4E)-4-(3H-1,3-benzoxazol-2-ylidene)-3-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-methylcyclohexa-2,4-dien-1-one
—— (6E)-6-(3H-1,3-benzoxazol-2-ylidene)-4-[[5-(2-nitrophenyl)furan-2-yl]methylideneamino]cyclohexa-2,4-dien-1-one —— C24H15N3O5
(6E)-6-(3H-1,3-benzoxazol-2-ylidene)-4-[[5-(2-nitrophenyl)furan-2-yl]methylideneamino]cyclohexa-2,4-dien-1-one
—— (6Z)-2-ethoxy-6-[[[(4E)-4-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-3-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one —— C23H20N2O4
(6Z)-2-ethoxy-6-[[[(4E)-4-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-3-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one
—— (4Z)-4-[[[(3Z)-3-(3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2,3-dibromo-6-methoxycyclohexa-2,5-dien-1-one —— C21H14Br2N2O4
(4Z)-4-[[[(3Z)-3-(3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2,3-dibromo-6-methoxycyclohexa-2,5-dien-1-one
—— (6Z)-4-[[(E)-3-(4-bromo-3-nitrophenyl)prop-2-enylidene]amino]-6-(5-methyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one —— C23H16BrN3O4
(6Z)-4-[[(E)-3-(4-bromo-3-nitrophenyl)prop-2-enylidene]amino]-6-(5-methyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one
—— (6Z)-4,5-dibromo-2-ethoxy-6-[[[(4Z)-4-(6-methyl-3H-1,3-benzoxazol-2-ylidene)-3-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one —— C23H18Br2N2O4
(6Z)-4,5-dibromo-2-ethoxy-6-[[[(4Z)-4-(6-methyl-3H-1,3-benzoxazol-2-ylidene)-3-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one
—— (6E)-2,4-dichloro-6-[[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one —— C22H16Cl2N2O3
(6E)-2,4-dichloro-6-[[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one
—— (6Z)-4,5-dibromo-2-ethoxy-6-[[[(3Z)-3-(6-methyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one —— C23H18Br2N2O4
(6Z)-4,5-dibromo-2-ethoxy-6-[[[(3Z)-3-(6-methyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one
—— (6Z)-4,5-dibromo-2-ethoxy-6-[[[(3Z)-3-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one —— C23H18Br2N2O4
(6Z)-4,5-dibromo-2-ethoxy-6-[[[(3Z)-3-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one
—— (6Z)-6-(3H-1,3-benzoxazol-2-ylidene)-4-[(3-chlorophenyl)methylideneamino]cyclohexa-2,4-dien-1-one —— C20H13ClN2O2
(6Z)-6-(3H-1,3-benzoxazol-2-ylidene)-4-[(3-chlorophenyl)methylideneamino]cyclohexa-2,4-dien-1-one
—— (6E)-4-bromo-6-[[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-methoxycyclohexa-2,4-dien-1-one —— C23H19BrN2O4
(6E)-4-bromo-6-[[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-methoxycyclohexa-2,4-dien-1-one
—— (6E)-4-chloro-6-[[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-nitrocyclohexa-2,4-dien-1-one —— C22H16ClN3O5
(6E)-4-chloro-6-[[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-nitrocyclohexa-2,4-dien-1-one
—— (6E)-4-[(2,4-dichlorophenyl)methylideneamino]-6-(5,7-dimethyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one —— C22H16Cl2N2O2
(6E)-4-[(2,4-dichlorophenyl)methylideneamino]-6-(5,7-dimethyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one
—— (6E)-4-[[(E)-(3-bromo-6-oxocyclohexa-2,4-dien-1-ylidene)methyl]amino]-6-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one —— C22H17BrN2O3
(6E)-4-[[(E)-(3-bromo-6-oxocyclohexa-2,4-dien-1-ylidene)methyl]amino]-6-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one
—— (6Z)-6-[[[(3Z)-3-(3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-bromo-4-nitrocyclohexa-2,4-dien-1-one —— C20H12BrN3O5
(6Z)-6-[[[(3Z)-3-(3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-bromo-4-nitrocyclohexa-2,4-dien-1-one
—— (6E)-4-bromo-2-chloro-6-[[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one —— C22H16BrClN2O3
(6E)-4-bromo-2-chloro-6-[[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one
—— (6E)-2-bromo-4-chloro-6-[[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one —— C22H16BrClN2O3
(6E)-2-bromo-4-chloro-6-[[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one
—— (6Z)-2-bromo-6-[[[(3E)-3-(5,7-dimethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-4-nitrocyclohexa-2,4-dien-1-one —— C22H16BrN3O5
(6Z)-2-bromo-6-[[[(3E)-3-(5,7-dimethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-4-nitrocyclohexa-2,4-dien-1-one
—— (6E)-6-[[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-nitrocyclohexa-2,4-dien-1-one —— C22H17N3O5
(6E)-6-[[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-nitrocyclohexa-2,4-dien-1-one
—— (6Z)-2-chloro-6-[[[(3E)-3-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-4-nitrocyclohexa-2,4-dien-1-one —— C21H14ClN3O5
(6Z)-2-chloro-6-[[[(3E)-3-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-4-nitrocyclohexa-2,4-dien-1-one
—— (6E)-4-[(6-bromo-1,3-benzodioxol-5-yl)methylideneamino]-6-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one —— C23H17BrN2O4
(6E)-4-[(6-bromo-1,3-benzodioxol-5-yl)methylideneamino]-6-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)cyclohexa-2,4-dien-1-one
—— (6Z)-6-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-4-[[(E)-3-(2-nitrophenyl)prop-2-enylidene]amino]cyclohexa-2,4-dien-1-one —— C23H17N3O4
(6Z)-6-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-4-[[(E)-3-(2-nitrophenyl)prop-2-enylidene]amino]cyclohexa-2,4-dien-1-one
—— (6Z)-4-bromo-6-[[[(3E)-3-(5,7-dimethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-nitrocyclohexa-2,4-dien-1-one —— C22H16BrN3O5
(6Z)-4-bromo-6-[[[(3E)-3-(5,7-dimethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-nitrocyclohexa-2,4-dien-1-one
—— (6E)-6-[[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-methoxycyclohexa-2,4-dien-1-one —— C23H20N2O4
(6E)-6-[[[(3E)-3-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-methoxycyclohexa-2,4-dien-1-one
—— (6Z)-4-bromo-2-chloro-6-[[[(3E)-3-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one —— C21H14BrClN2O3
(6Z)-4-bromo-2-chloro-6-[[[(3E)-3-(5-methyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one
—— (6Z)-4-bromo-2-chloro-6-[[[(3E)-3-(5,7-dimethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one —— C22H16BrClN2O3
(6Z)-4-bromo-2-chloro-6-[[[(3E)-3-(5,7-dimethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]cyclohexa-2,4-dien-1-one
—— (6E)-6-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-[[(E)-3-(2-nitrophenyl)prop-2-enylidene]amino]cyclohexa-2,4-dien-1-one —— C24H19N3O4
(6E)-6-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-[[(E)-3-(2-nitrophenyl)prop-2-enylidene]amino]cyclohexa-2,4-dien-1-one
—— (6Z)-6-[[[(3E)-3-(5,7-dimethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-ethoxycyclohexa-2,4-dien-1-one —— C24H22N2O4
(6Z)-6-[[[(3E)-3-(5,7-dimethyl-3H-1,3-benzoxazol-2-ylidene)-4-oxocyclohexa-1,5-dien-1-yl]amino]methylidene]-2-ethoxycyclohexa-2,4-dien-1-one
—— (6E)-6-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-[[(E)-3-(4-nitrophenyl)prop-2-enylidene]amino]cyclohexa-2,4-dien-1-one —— C24H19N3O4
(6E)-6-(5-ethyl-3H-1,3-benzoxazol-2-ylidene)-4-[[(E)-3-(4-nitrophenyl)prop-2-enylidene]amino]cyclohexa-2,4-dien-1-one