C.I.Pigment Red 254; Bright Red [SE, WN]; Ferrari Red*; Blockx Red [BL]; Chinese Red, vermillion (hue) [SI]; Irgazin DPP Red BO [KP]; Lukas Red [LK]; Matisse Red Light [MT]; Naphthol Red Medium? [RT]; Permanent Red [RT]; Permanent Red Deep [CH, RT; Bis-(p-chrolopheny)-1.4-diketopyrrolo(3.4-c)pyrrole; pigment red 254; Plasco red 254; 3,6-bis(4-chlorophenyl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione