Synonyms: 1,9-def:6,5,10-d’e’f’]diisoquinoline-1,3,8,10(2H,9H)-tetrone,2,9-bis(2-phenylethyl)-Anthra[2;2-phenylethyl)-;N,N'-DI(2-PHENYLETHYL)-PERYLENE-TETRACARBONIC ACID, AMIDE;2,9-bis(2-phenylethyl)anthra[2,1,9-def:6,5,10-d'e'f']diisoquinoline-1,3,8,10(2H,9H)-tetrone;Pigment Black 31;PERYLENE BLACK;2,9-Di(2-phenylethyl)-anthra2,1,9-def:6,5,10-d'e'f'diisoquinoline-1,3,8,10-tetrone;2,9-Diphenethyl-3a,6-dihydro-anthra[2,1,9-def,6,5,10-d'e'f']diisoquinoline-1,3,8,10-tetraone