15865:2; C.I. Pigment Red 48, calcium salt (1:1); C.I. Pigment Red 48, calcium salt; Pigment Red 48 calcium saltcalcium (4Z)-4-[2-(5-chloro-4-methyl-2-sulfonatophenyl)hydrazinylidene]-3-oxo-3,4-dihydronaphthalene-2-carboxylate; calcium 4-[(E)-(5-chloro-4-methyl-2-sulfonatophenyl)diazenyl]-3-hydroxynaphthalene-2-carboxylate; Pigment Red 48:2