183804-49-1 2-Naphthalenecarboxylic acid, 4-((4-chloro-5-methyl-2-sulfophenyl)azo)-3-hydroxy-, calcium salt (2:1) 52202-90-1 C.I. Pigment Red 52:1 Calcium dihydrogen bis(4-((4-chloro-6-sulphonato-m-tolyl)azo)-3-hydroxy-2-naphthoate) EINECS 257-731-5