Synonyms: Thiosulfuricacid (H2S2O3),S-[4-[[1-[[(4-methoxyphenyl)amino]carbonyl]-2-oxopropyl]azo]phenyl] ester,monosodium salt (9CI); Thiosulfuric acid, S-ester with2-[(p-mercaptophenyl)azo]-p-acetoacetanisidide, monosodium salt (8CI);p-Acetoacetanisidide, 2-[(p-mercaptophenyl)azo]-, hydrogen sulfate (ester),monosodium salt (8CI)