Pigment Red 52:1

2-Naphthalenecarboxylic acid, 4-((4-chloro-5-methyl-2-sulfophenyl)azo)-3-hydroxy-, calcium salt (2:1) ; calcium (4Z)-4-[(4-chloro-5-methyl-2-sulfo-phenyl)hydrazinylidene]-3-oxo-naphthalene-2-carboxylate ; Calcium dihydrogen bis(4-((4-chloro-6-sulphonato-m-tolyl)azo)-3-hydroxy-2-naphthoate) ; 183804-49-1 ;