Benzenesulfonic acid,5-chloro-2-[(2-hydroxy-1-naphthalenyl)azo]-4-methyl,calcium salt, Einecs 268-057-6, C.I.Pigment Red 53:2, Calcium Lake Red C, Pigment Red 53:2, Bis[2-(2-hydroxy-1-naphtylazo)-4-methyl-5-chlorobenzenesulfonic acid] calcium salt, 5-chloro-2-[(2-hydroxy-1-naphthalenyl)azo]-4-methyl-benzenesulfonic aci calcium salt, 5-chloro-2-[(2-hydroxy-1-naphthalenyl)azo]-4-methyl-benzenesulfonic aci cal