The molecule is a linear tetrapyrrole anion obtained by deprotonation of the two carboxy groups and protonation of the imine nitrogen of biliverdin delta; It is the major microspecies at pH 7.3 (according to Marvin v 6.2.0.). It is a linear tetrapyrrole anion and a dicarboxylic acid monoanion. It is a conjugate base of a biliverdin delta.
3-[(2Z)-2-[[3-(2-carboxylatoethyl)-4-methyl-5-oxopyrrol-1-ium-2-yl]methylidene]-5-[(Z)-[(5Z)-3-ethenyl-5-[(4-ethenyl-3-methyl-2-oxo-1,3-dihydropyrrol-5-yl)methylidene]-4-methylpyrrol-2-ylidene]methyl]-4-methylpyrrol-3-yl]propanoate