Einecs 228-378-4, (Acenaphthen-(1))-(thionaphthen-(2))-indigo, 2-(1-Oxoacenaphthene-2-ylidene)benzo[b]thiophene-3(2H)-one, 1'-Acenaphthen-2-thianaphthenindigo, Acid Violet 9 (C.I.), 2-Thionaphthen-acenaphthylen-indigo, 2-(2-oxo-2H-acenaphth-1-ylidene)benzo[b]thiophene-3(2H)-one, Vat Red 45, 2-(2-Oxoacenaphthylen-1(2H)-ylidene)benzo[b]thiophen-3(2H)-one, C.I.Vat Red 45, 2-(2-Oxo-acenaphthen-1-yliden)-benzo[b]thiophen-3-on, 2-(2-oxo-acenaphthen-1-ylidene)-benzo[b]thiophen-3-one, C.I. Acid Violet 9