Is Benzo[b]thiophen-3(2H)-one, 4,7-dichloro-2-(4,7-dichloro-3-oxobenzo[b]thien-2(3H)-ylidene)- vegan?

Vat Red 41 is also known as Benzo[b]thiophen-3(2H)-one, 4,7-dichloro-2-(4,7-dichloro-3-oxobenzo[b]thien-2(3H)-ylidene)-.

Thioindigo is a synthetic organosulfur dye used to dye polyester fabric. It is structurally related to the plant-derived dye indigo, with the two NH groups replaced by two sulfur atoms, producing a pink shade. It is manufactured entirely from synthetic precursors.

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