Synonyms: Cobaltate(4-), (29H,31H-phthalocyanine-2,9,16,23-tetrasulfonato(6-)-kappaN29,kappaN30,kappaN31,kappaN32)-, hydrogen (1:4), (SP-4-1)-;Cobalt 4,4',4'',4'''-phthalocyaninetetrasulfonate;Cobaltate(4-), (29H,31H-phthalocyanine-2,9,16,23-tetrasulfonato(6-)-N29,N39,N31,N32)-, tetrahydrogen, (SP-4-1)-;Cobaltate(4-), (29H,31H-phthalocyanine-2,9,16,23-tetrasulfonato(6-)-kappaN29,kappaN30,kappaN31,kappaN32)-, tetrahydrogen, (SP-4-1)-;Tetrahydrogen (29H,31H-phthalocyanine-2,9,16,23-tetrasulphonato(6-)-N29,N30,N31,N32)cobaltate(4-);cobalt(2+) hydrogen phthalocyanine-29,30-diide-2,9,16,23-tetrasulfonate (1:4:1)