2,7-Naphthalenedisulfonicacid, 4,5-dihydroxy-3,6-bis[(2-phosphonophenyl)azo]- (9CI);2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy-3,6-bis[(o-phosphonophenyl)azo]-(8CI); Phosphonazo III
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