Synonyms: Cuprate(4-),[29H,31H-phthalocyanine-1,9,16,23-tetrasulfonato(6-)-N29,N30,N31,N32]-,tetrasodium, (SP-4-2)-; Cuprate(4-),[29H,31H-phthalocyanine-1,9,16,23-tetrasulfonato(6-)-kN29,kN30,kN31,kN32]-, tetrasodium, (SP-4-2)-(9CI); 29H,31H-Phthalocyanine-1,9,16,23-tetrasulfonic acid, copper complex