Oxovitisin A
Oxovitisin A is an oxovitisin, a type of pyranoanthocyanin with a 2-pyrone component. It is found in aged port wines. It does not contain an oxonium ion component, as anthocyanins do. Therefore, it does not have an absorption maximum at 520 nm. Oxovitisins are stable yellowish pigments with similar unique spectral features, displaying only a pronounced broad band around 370 nm in the UV−vis spectrum. It is an oxidative derivative of vitisin A.