12238-30-1 2-Naphthalenecarboxylic acid, 4-((4-chloro-5-methyl-2-sulfophenyl)azo)-3-hydroxy-, disodium salt 5858-82-2 C.I. Pigment Red 52, disodium salt Disodium 4-((4-chloro-5-methyl-2-sulphonatophenyl)azo)-3-hydroxy-2-naphthoate EINECS 227-498-4