Synonyms: 5,9,14,18-Anthrazinetetrone, 7,16-dichloro-6,15-dihydro-, mixt. with bromobenzo[rst]phenanthro[10,1,2-cde]pentaphene-9,18-dione;5,9,14,18-Anthrazinetetrone,7,16-dichloro-6,15-dihydro-,mixt. with bromobenzo[rst]phenanthro[10,1,2-cde]pentaphene-9,18-dione;Vat blue 6:1