Violanthrone, also known as dibenzanthrone, is an organic compound that serves as a vat dye and a precursor to other vat dyes. X-ray crystallography confirms that the molecule is planar with C2v symmetry. Isomeric with violanthrone is isoviolanthrone, which has a centrosymmetric structure. Synthesis It is produced by coupling of two molecules of benzanthrone. References Fluorescent dyes Ketones Polycyclic aromatic compounds