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    —— (6E)-4-amino-3-[[4-[(2E)-2-(2-amino-4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]phenyl]diazenyl]-5-oxo-6-(phenylhydrazinylidene)naphthalene-2,7-disulfonic acid —— C28H22N8O8S2
    (6E)-4-amino-3-[[4-[(2E)-2-(2-amino-4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]phenyl]diazenyl]-5-oxo-6-(phenylhydrazinylidene)naphthalene-2,7-disulfonic acid
    —— (6E)-6-[(2-nitrophenyl)hydrazinylidene]-2,4-bis(2,4,4-trimethylpentan-2-yl)cyclohexa-2,4-dien-1-one —— C28H41N3O3
    (6E)-6-[(2-nitrophenyl)hydrazinylidene]-2,4-bis(2,4,4-trimethylpentan-2-yl)cyclohexa-2,4-dien-1-one
    —— (6E)-4-amino-3-[[4-[(4-aminophenyl)diazenyl]-2-methoxy-5-methylphenyl]diazenyl]-6-[[4-[(4-aminophenyl)diazenyl]-2-methoxy-5-methylphenyl]hydrazinylidene]-5-oxonaphthalene-2,7-disulfonic acid —— C38H35N11O9S2
    (6E)-4-amino-3-[[4-[(4-aminophenyl)diazenyl]-2-methoxy-5-methylphenyl]diazenyl]-6-[[4-[(4-aminophenyl)diazenyl]-2-methoxy-5-methylphenyl]hydrazinylidene]-5-oxonaphthalene-2,7-disulfonic acid
    —— (6E)-4-butyl-6-[[4-[1-[4-[(2E)-2-(3-butyl-6-oxocyclohexa-2,4-dien-1-ylidene)hydrazinyl]-3-methylphenyl]cyclohexyl]-2-methylphenyl]hydrazinylidene]cyclohexa-2,4-dien-1-one —— C40H48N4O2
    (6E)-4-butyl-6-[[4-[1-[4-[(2E)-2-(3-butyl-6-oxocyclohexa-2,4-dien-1-ylidene)hydrazinyl]-3-methylphenyl]cyclohexyl]-2-methylphenyl]hydrazinylidene]cyclohexa-2,4-dien-1-one
    —— (6E)-4-amino-3-[[4-[(4-anilino-5-sulfonaphthalen-1-yl)diazenyl]phenyl]diazenyl]-5-oxo-6-(phenylhydrazinylidene)naphthalene-2,7-disulfonic acid —— C38H28N8O10S3
    (6E)-4-amino-3-[[4-[(4-anilino-5-sulfonaphthalen-1-yl)diazenyl]phenyl]diazenyl]-5-oxo-6-(phenylhydrazinylidene)naphthalene-2,7-disulfonic acid
    —— (6Z)-6-(phenylhydrazinylidene)-4-(2-phenylpropan-2-yl)cyclohexa-2,4-dien-1-one —— C21H20N2O
    (6Z)-6-(phenylhydrazinylidene)-4-(2-phenylpropan-2-yl)cyclohexa-2,4-dien-1-one
    —— (6Z)-4-[(2,4-dimethylphenyl)diazenyl]-3-hydroxy-6-[(2-methylphenyl)hydrazinylidene]cyclohexa-2,4-dien-1-one —— C21H20N4O2
    (6Z)-4-[(2,4-dimethylphenyl)diazenyl]-3-hydroxy-6-[(2-methylphenyl)hydrazinylidene]cyclohexa-2,4-dien-1-one
    —— (6E)-6-[[4-[(2-chlorophenyl)-[2,5-dimethyl-4-[(2E)-2-(3-methyl-6-oxocyclohexa-2,4-dien-1-ylidene)hydrazinyl]phenyl]methyl]-2,5-dimethylphenyl]hydrazinylidene]-4-methylcyclohexa-2,4-dien-1-one —— C37H35ClN4O2
    (6E)-6-[[4-[(2-chlorophenyl)-[2,5-dimethyl-4-[(2E)-2-(3-methyl-6-oxocyclohexa-2,4-dien-1-ylidene)hydrazinyl]phenyl]methyl]-2,5-dimethylphenyl]hydrazinylidene]-4-methylcyclohexa-2,4-dien-1-one
    —— (6E)-6-[(6-methoxy-1,3-benzothiazol-2-yl)hydrazinylidene]-3-methylcyclohexa-2,4-dien-1-one —— C15H13N3O2S
    (6E)-6-[(6-methoxy-1,3-benzothiazol-2-yl)hydrazinylidene]-3-methylcyclohexa-2,4-dien-1-one
    —— (6E)-4-amino-3-[(3-nitrophenyl)diazenyl]-5-oxo-6-(phenylhydrazinylidene)naphthalene-2,7-disulfonic acid —— C22H16N6O9S2
    (6E)-4-amino-3-[(3-nitrophenyl)diazenyl]-5-oxo-6-(phenylhydrazinylidene)naphthalene-2,7-disulfonic acid
    —— (6R,7R)-7-[[(2E)-2-(2-amino-1,3-thiazol-4-yl)-2-methoxyiminoacetyl]amino]-3-[(1-methylpyrrolidin-1-ium-1-yl)methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate;1-cyclopropyl-6-fluoro-8-methoxy-7-(3-methylpiperazin-1-yl)-4-oxoquinoline-3-carboxylic acid —— C38H46FN9O9S2
    (6R,7R)-7-[[(2E)-2-(2-amino-1,3-thiazol-4-yl)-2-methoxyiminoacetyl]amino]-3-[(1-methylpyrrolidin-1-ium-1-yl)methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate;1-cyclopropyl-6-fluoro-8-methoxy-7-(3-methylpiperazin-1-yl)-4-oxoquinoline-3-carboxylic acid
    —— (6E)-3-(diethylamino)-6-[(2-hydroxy-5-nitrophenyl)hydrazinylidene]cyclohexa-2,4-dien-1-one —— C16H18N4O4
    (6E)-3-(diethylamino)-6-[(2-hydroxy-5-nitrophenyl)hydrazinylidene]cyclohexa-2,4-dien-1-one
    —— 6-bromo-3-[(2E)-3-cyclohexyl-2-[(E)-p-tolylmethylenehydrazono]thiazol-4-yl]chromen-2-one —— C26H24BrN3O2S
    6-bromo-3-[(2E)-3-cyclohexyl-2-[(E)-p-tolylmethylenehydrazono]thiazol-4-yl]chromen-2-one
    —— (6E)-2,4-bis(2-methylbutan-2-yl)-6-[(2-nitrophenyl)hydrazinylidene]cyclohexa-2,4-dien-1-one —— C22H29N3O3
    (6E)-2,4-bis(2-methylbutan-2-yl)-6-[(2-nitrophenyl)hydrazinylidene]cyclohexa-2,4-dien-1-one
    —— 6-bromo-3-[(2E)-3-cyclohexyl-2-[(E)-(4-fluorophenyl)methylenehydrazono]thiazol-4-yl]chromen-2-one —— C25H21BrFN3O2S
    6-bromo-3-[(2E)-3-cyclohexyl-2-[(E)-(4-fluorophenyl)methylenehydrazono]thiazol-4-yl]chromen-2-one
    —— 6-acetylimino-4-oxo-2-[2-[3-(2-sulfooxyethylsulfonyl)phenyl]hydrazinyl]naphthalene-1-sulfonic acid —— C20H19N3O11S3
    6-acetylimino-4-oxo-2-[2-[3-(2-sulfooxyethylsulfonyl)phenyl]hydrazinyl]naphthalene-1-sulfonic acid
    —— (6R,7R)-7-[[(2E)-2-(2-amino-1,3-thiazol-4-yl)-2-methoxyiminoacetyl]amino]-6,7-dimethyl-3-[(1-methyl-5,6-dioxo-4H-1,2,4-triazin-3-yl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid —— C20H22N8O7S3
    (6R,7R)-7-[[(2E)-2-(2-amino-1,3-thiazol-4-yl)-2-methoxyiminoacetyl]amino]-6,7-dimethyl-3-[(1-methyl-5,6-dioxo-4H-1,2,4-triazin-3-yl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
    —— (6E)-4-amino-3-[(4-nitrophenyl)diazenyl]-5-oxo-6-[(4-sulfophenyl)hydrazinylidene]naphthalene-2,7-disulfonic acid —— C22H16N6O12S3
    (6E)-4-amino-3-[(4-nitrophenyl)diazenyl]-5-oxo-6-[(4-sulfophenyl)hydrazinylidene]naphthalene-2,7-disulfonic acid
    —— 6-[4-[(2E)-2-[6-[[6-[[(6E)-6-[[4-(5-carboxypentyl)phenyl]hydrazinylidene]-5-oxo-7-sulfonaphthalen-2-yl]carbamoyl]pyridine-2-carbonyl]amino]-1-oxo-3-sulfonaphthalen-2-ylidene]hydrazinyl]phenyl]hexanoic acid —— C51H47N7O14S2
    6-[4-[(2E)-2-[6-[[6-[[(6E)-6-[[4-(5-carboxypentyl)phenyl]hydrazinylidene]-5-oxo-7-sulfonaphthalen-2-yl]carbamoyl]pyridine-2-carbonyl]amino]-1-oxo-3-sulfonaphthalen-2-ylidene]hydrazinyl]phenyl]hexanoic acid
    —— (6Z)-6-[(4-bromopyridin-2-yl)hydrazinylidene]-3-(diethylamino)cyclohexa-2,4-dien-1-one —— C15H17BrN4O
    (6Z)-6-[(4-bromopyridin-2-yl)hydrazinylidene]-3-(diethylamino)cyclohexa-2,4-dien-1-one
    —— (6Z)-4-amino-3-[[4-[4-[(2E)-2-(2-hydroxy-4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]-3-methylphenyl]-2-methylphenyl]diazenyl]-5-oxo-6-[(4-sulfophenyl)hydrazinylidene]naphthalene-2,7-disulfonic acid —— C36H29N7O12S3
    (6Z)-4-amino-3-[[4-[4-[(2E)-2-(2-hydroxy-4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]-3-methylphenyl]-2-methylphenyl]diazenyl]-5-oxo-6-[(4-sulfophenyl)hydrazinylidene]naphthalene-2,7-disulfonic acid
    —— 6-bromo-3-[(2E)-3-cyclohexyl-2-[(E)-(2,5-dimethoxyphenyl)methylenehydrazono]thiazol-4-yl]chromen-2-one —— C27H26BrN3O4S
    6-bromo-3-[(2E)-3-cyclohexyl-2-[(E)-(2,5-dimethoxyphenyl)methylenehydrazono]thiazol-4-yl]chromen-2-one
    —— (6E)-4-amino-3-[(4-nitrophenyl)diazenyl]-5-oxo-6-[(3-sulfophenyl)hydrazinylidene]naphthalene-2,7-disulfonic acid —— C22H16N6O12S3
    (6E)-4-amino-3-[(4-nitrophenyl)diazenyl]-5-oxo-6-[(3-sulfophenyl)hydrazinylidene]naphthalene-2,7-disulfonic acid
    —— (6E)-4-amino-3-[(2-methyl-5-nitrophenyl)diazenyl]-5-oxo-6-(phenylhydrazinylidene)naphthalene-2,7-disulfonic acid —— C23H18N6O9S2
    (6E)-4-amino-3-[(2-methyl-5-nitrophenyl)diazenyl]-5-oxo-6-(phenylhydrazinylidene)naphthalene-2,7-disulfonic acid
    —— 6-[4-[(2E)-2-[6-[[6-[[(6E)-6-[[4-(5-carboxypentyl)phenyl]hydrazinylidene]-5-oxo-7-sulfonaphthalen-2-yl]carbamoyl]-4-oxopyran-2-carbonyl]amino]-1-oxo-3-sulfonaphthalen-2-ylidene]hydrazinyl]phenyl]hexanoic acid —— C51H46N6O16S2
    6-[4-[(2E)-2-[6-[[6-[[(6E)-6-[[4-(5-carboxypentyl)phenyl]hydrazinylidene]-5-oxo-7-sulfonaphthalen-2-yl]carbamoyl]-4-oxopyran-2-carbonyl]amino]-1-oxo-3-sulfonaphthalen-2-ylidene]hydrazinyl]phenyl]hexanoic acid
    —— (6E)-2,4-bis(phenyldiazenyl)-6-(phenylhydrazinylidene)cyclohexa-2,4-dien-1-one —— C24H18N6O
    (6E)-2,4-bis(phenyldiazenyl)-6-(phenylhydrazinylidene)cyclohexa-2,4-dien-1-one
    —— (6E)-2-methyl-4-phenyldiazenyl-6-(phenylhydrazinylidene)cyclohexa-2,4-dien-1-one —— C19H16N4O
    (6E)-2-methyl-4-phenyldiazenyl-6-(phenylhydrazinylidene)cyclohexa-2,4-dien-1-one
    —— (6E)-6-[[2-[2-(2-hydroxy-3-nitrophenyl)-3-[2-[(2E)-2-(5-nitro-6-oxocyclohexa-2,4-dien-1-ylidene)hydrazinyl]ethyl]imidazolidin-1-yl]ethylamino]methylidene]-2-nitrocyclohexa-2,4-dien-1-one —— C26H26N8O9
    (6E)-6-[[2-[2-(2-hydroxy-3-nitrophenyl)-3-[2-[(2E)-2-(5-nitro-6-oxocyclohexa-2,4-dien-1-ylidene)hydrazinyl]ethyl]imidazolidin-1-yl]ethylamino]methylidene]-2-nitrocyclohexa-2,4-dien-1-one
    —— (6R,7R)-7-[[(2E)-2-(2-amino-1,3-thiazol-4-yl)-2-methoxyiminoacetyl]amino]-3-[(1-methylpyrrolidin-1-ium-1-yl)methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate;1-cyclopropyl-6-fluoro-4-oxo-7-piperazin-1-ylquinoline-3-carboxylic acid —— C36H42FN9O8S2
    (6R,7R)-7-[[(2E)-2-(2-amino-1,3-thiazol-4-yl)-2-methoxyiminoacetyl]amino]-3-[(1-methylpyrrolidin-1-ium-1-yl)methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate;1-cyclopropyl-6-fluoro-4-oxo-7-piperazin-1-ylquinoline-3-carboxylic acid
    —— 6-methyl-N-[(E)-(4-oxo-3-propyl-thiazolidin-2-ylidene)amino]imidazo[2,1-b]thiazole-5-carboxamide —— C13H15N5O2S2
    6-methyl-N-[(E)-(4-oxo-3-propyl-thiazolidin-2-ylidene)amino]imidazo[2,1-b]thiazole-5-carboxamide
    —— 6-bromo-3-[(2Z)-2-[(E)-(4-chlorophenyl)methylenehydrazono]-3-ethyl-thiazol-4-yl]chromen-2-one —— C21H15BrClN3O2S
    6-bromo-3-[(2Z)-2-[(E)-(4-chlorophenyl)methylenehydrazono]-3-ethyl-thiazol-4-yl]chromen-2-one
    —— 6-amino-2-[[(E)-benzylideneamino]carbamoylamino]-1,3-dioxo-benzo[de]isoquinoline-5,8-disulfonic acid —— C20H15N5O9S2
    6-amino-2-[[(E)-benzylideneamino]carbamoylamino]-1,3-dioxo-benzo[de]isoquinoline-5,8-disulfonic acid
    —— 6-cyclohexyl-N-[(E)-(2,5-dimethyl-1-phenyl-pyrrol-3-yl)methyleneamino]quinolin-4-amine —— C28H30N4
    6-cyclohexyl-N-[(E)-(2,5-dimethyl-1-phenyl-pyrrol-3-yl)methyleneamino]quinolin-4-amine
    —— 6-bromo-3-[(2Z)-2-[[(E)-(3-ethoxy-4-oxocyclohexa-2,5-dien-1-ylidene)methyl]hydrazinylidene]-3-prop-2-enyl-1,3-thiazol-4-yl]chromen-2-one —— C24H20BrN3O4S
    6-bromo-3-[(2Z)-2-[[(E)-(3-ethoxy-4-oxocyclohexa-2,5-dien-1-ylidene)methyl]hydrazinylidene]-3-prop-2-enyl-1,3-thiazol-4-yl]chromen-2-one
    —— 6-cyclohexyl-N-[(E)-(2,5-dimethyl-1-phenyl-pyrrol-3-yl)methyleneamino]-2-methyl-quinolin-4-amine —— C29H32N4
    6-cyclohexyl-N-[(E)-(2,5-dimethyl-1-phenyl-pyrrol-3-yl)methyleneamino]-2-methyl-quinolin-4-amine
    —— (6E)-4-amino-6-[(Z)-[4-[3-hydroxy-4-[2-[5-methyl-3-oxo-2-(4-sulfophenyl)-1H-pyrazol-4-yl]hydrazinyl]phenyl]-6-oxocyclohexa-2,4-dien-1-ylidene]hydrazinylidene]-5-oxonaphthalene-1,3-disulfonic acid;copper —— C32H25Cu2N7O13S3
    (6E)-4-amino-6-[(Z)-[4-[3-hydroxy-4-[2-[5-methyl-3-oxo-2-(4-sulfophenyl)-1H-pyrazol-4-yl]hydrazinyl]phenyl]-6-oxocyclohexa-2,4-dien-1-ylidene]hydrazinylidene]-5-oxonaphthalene-1,3-disulfonic acid;copper
    —— 6-[(E)-(diaminomethylidenehydrazinylidene)methyl]-2,3-dimethoxybenzoic acid;dihydroxy(oxo)azanium —— C11H16N5O7+
    6-[(E)-(diaminomethylidenehydrazinylidene)methyl]-2,3-dimethoxybenzoic acid;dihydroxy(oxo)azanium
    —— 6-methoxy-4-methyl-N-[(Z)-[phenyl(pyridin-2-yl)methylidene]amino]quinolin-2-amine —— C23H20N4O
    6-methoxy-4-methyl-N-[(Z)-[phenyl(pyridin-2-yl)methylidene]amino]quinolin-2-amine
    —— 6-methoxy-N-[(E)-[(2E)-2-[(6-methoxy-4-methyl-2,6-dihydroquinolin-2-yl)hydrazinylidene]propylidene]amino]-4-methylquinolin-2-amine —— C25H28N6O2
    6-methoxy-N-[(E)-[(2E)-2-[(6-methoxy-4-methyl-2,6-dihydroquinolin-2-yl)hydrazinylidene]propylidene]amino]-4-methylquinolin-2-amine
    —— (6E)-4-amino-6-[[4-[(E)-2-[4-[(2E)-2-(1-hydroxy-8-imino-5,7-disulfo-1,5-dihydronaphthalen-2-ylidene)hydrazinyl]-2-sulfophenyl]ethenyl]-3-sulfophenyl]hydrazinylidene]-5-oxonaphthalene-1,3-disulfonic acid —— C34H28N6O20S6
    (6E)-4-amino-6-[[4-[(E)-2-[4-[(2E)-2-(1-hydroxy-8-imino-5,7-disulfo-1,5-dihydronaphthalen-2-ylidene)hydrazinyl]-2-sulfophenyl]ethenyl]-3-sulfophenyl]hydrazinylidene]-5-oxonaphthalene-1,3-disulfonic acid
    —— (6E)-4-amino-5-oxo-3-[[4-[4-[(2Z)-2-(2-oxo-6,8-disulfonaphthalen-1-ylidene)hydrazinyl]phenyl]phenyl]diazenyl]-6-(phenylhydrazinylidene)naphthalene-2,7-disulfonic acid —— C38H27N7O14S4
    (6E)-4-amino-5-oxo-3-[[4-[4-[(2Z)-2-(2-oxo-6,8-disulfonaphthalen-1-ylidene)hydrazinyl]phenyl]phenyl]diazenyl]-6-(phenylhydrazinylidene)naphthalene-2,7-disulfonic acid
    —— 6-methoxy-N-[(E)-(4-methoxyphenyl)methyleneamino]-2-methyl-quinolin-4-amine —— C19H19N3O2
    6-methoxy-N-[(E)-(4-methoxyphenyl)methyleneamino]-2-methyl-quinolin-4-amine
    —— (6Z)-6-[(4-chlorophenyl)hydrazinylidene]-4,5-bis(hydroxymethyl)-2-methylpyridin-3-one —— C14H14ClN3O3
    (6Z)-6-[(4-chlorophenyl)hydrazinylidene]-4,5-bis(hydroxymethyl)-2-methylpyridin-3-one
    —— (6E)-4-amino-3-[(4-nitrophenyl)diazenyl]-5-oxo-6-[[4-[4-[2-(4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]phenyl]sulfanylphenyl]hydrazinylidene]naphthalene-2,7-disulfonic acid —— C34H24N8O10S3
    (6E)-4-amino-3-[(4-nitrophenyl)diazenyl]-5-oxo-6-[[4-[4-[2-(4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]phenyl]sulfanylphenyl]hydrazinylidene]naphthalene-2,7-disulfonic acid
    —— (6E)-4-amino-3-[(4-methylphenyl)diazenyl]-6-[(4-nitrophenyl)hydrazinylidene]-5-oxonaphthalene-2,7-disulfonic acid —— C23H18N6O9S2
    (6E)-4-amino-3-[(4-methylphenyl)diazenyl]-6-[(4-nitrophenyl)hydrazinylidene]-5-oxonaphthalene-2,7-disulfonic acid
    —— 6-[(E)-furan-2-ylmethylideneamino]-1-methyl-2H-pyrazolo[3,4-d]pyrimidine-4-thione —— C11H9N5OS
    6-[(E)-furan-2-ylmethylideneamino]-1-methyl-2H-pyrazolo[3,4-d]pyrimidine-4-thione
    —— (6E)-6-[[4-(dimethylamino)-2-hydroxyphenyl]hydrazinylidene]-3-[(4E)-4-[[4-(dimethylamino)-2-hydroxyphenyl]hydrazinylidene]-3-oxocyclohexa-1,5-dien-1-yl]cyclohexa-2,4-dien-1-one —— C28H28N6O4
    (6E)-6-[[4-(dimethylamino)-2-hydroxyphenyl]hydrazinylidene]-3-[(4E)-4-[[4-(dimethylamino)-2-hydroxyphenyl]hydrazinylidene]-3-oxocyclohexa-1,5-dien-1-yl]cyclohexa-2,4-dien-1-one
    —— (6E)-4-amino-5-oxo-6-[[4-[(4-sulfophenyl)diazenyl]phenyl]hydrazinylidene]naphthalene-1,3-disulfonic acid —— C22H17N5O10S3
    (6E)-4-amino-5-oxo-6-[[4-[(4-sulfophenyl)diazenyl]phenyl]hydrazinylidene]naphthalene-1,3-disulfonic acid
    —— (6E)-4-amino-6-[[4-[(E)-2-[4-[(2E)-2-(8-amino-1-oxo-5,7-disulfonaphthalen-2-ylidene)hydrazinyl]-2-sulfophenyl]ethenyl]-3-sulfophenyl]hydrazinylidene]-5-oxonaphthalene-1,3-disulfonic acid —— C34H26N6O20S6
    (6E)-4-amino-6-[[4-[(E)-2-[4-[(2E)-2-(8-amino-1-oxo-5,7-disulfonaphthalen-2-ylidene)hydrazinyl]-2-sulfophenyl]ethenyl]-3-sulfophenyl]hydrazinylidene]-5-oxonaphthalene-1,3-disulfonic acid
    —— (6E)-4-amino-3-[(3-nitrophenyl)diazenyl]-5-oxo-6-[[4-[4-[(2E)-2-(1-oxo-4-sulfonaphthalen-2-ylidene)hydrazinyl]phenyl]phenyl]hydrazinylidene]naphthalene-2,7-disulfonic acid —— C38H26N8O13S3
    (6E)-4-amino-3-[(3-nitrophenyl)diazenyl]-5-oxo-6-[[4-[4-[(2E)-2-(1-oxo-4-sulfonaphthalen-2-ylidene)hydrazinyl]phenyl]phenyl]hydrazinylidene]naphthalene-2,7-disulfonic acid