C.I.56016;C.I.Vat Brown 21;Helindon Brown CRD;2,7-dichloro-3-(4-chloroanilino)-10~{H}-phenothiazine-1,4-dione;3-[(4-Chlorophenyl)amino]-2,7-dichloro-1H-phenothiazine-1,4(10H)-dione;1H-Phenothiazine-1,4(10H)-dione, 2,7-dichloro-3-[(4-chlorophenyl)amino]-