SMILES: C1=C(C(=O)NC(=O)C1=O)C2=C(NC(=O)C(=C2)O)O
Description: The molecule is an extended quinone obtained by formal autoxidation of 2,3,6-trihydroxypyridine. It has a role as a biological pigment. It derives from a 2,3,6-trihydroxypyridine. It is a conjugate acid of a nicotine blue(2-).