The molecule is a pyrrolecarboxylic acid that is pyrrole-2-carboxylic acid which is substituted at position 3 by a 1H-indol-3-yl group at at position 5 by a 5-hydroxy-1H-indol-3-yl group. It is a monocarboxylic acid, a member of hydroxyindoles and a pyrrolecarboxylic acid. It is a conjugate acid of a protoviolaceinate.
5-(5-hydroxy-1H-indol-3-yl)-3-(1H-indol-3-yl)-1H-pyrrole-2-carboxylic acid