2-[[4-[[4-[[4-[(1-Hydroxy-4-sulfo-2-naphtyl)azo]-7-sulfo-1-naphtyl]azo]-7-sulfo-1-naphtyl]azo]phenyl]amino]-2-oxoacetic acid C??? ??, ??, ??

2-[[4-[[4-[[4-[(1-Hydroxy-4-sulfo-2-naphtyl)azo]-7-sulfo-1-naphtyl]azo]-7-sulfo-1-naphtyl]azo]phenyl]amino]-2-oxoacetic acid ?? ?? ? ???

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2-[[4-[[4-[[4-[(1-Hydroxy-4-sulfo-2-naphtyl)azo]-7-sulfo-1-naphtyl]azo]-7-sulfo-1-naphtyl]azo]phenyl]amino]-2-oxoacetic acid ?? ??