17852-99-2 2-Naphthalenecarboxylic acid, 4-((4-chloro-5-methyl-2-sulfophenyl)azo)-3-hydroxy-, calcium salt (1:1) Calcium 4-((4-chloro-5-methyl-2-sulphonatophenyl)azo)-3-hydroxy-2-naphthoate EINECS 241-808-5