Synonyms: 2-Naphtho-o-toluidide,4'-chloro-3-hydroxy-, dihydrogen phosphate (ester), disodium salt (8CI);2-Naphtho-o-toluidide, 4'-chloro-3-hydroxy-, dihydrogen phosphate, disodiumsalt (7CI); 2-Naphtho-o-toluidide, 4'-chloro-3-hydroxy-, phosphate disodiumsalt (6CI)