Syonyms Name: 3-(2-(3-(2-Carboxy-ethyl)-5-(4-ethyl-3-methyl-5-oxo-1,5-dihydro-pyrrol-2-ylidenemethyl)-4-methyl-1H-pyrrol-2-ylmethyl)-5-(3-ethyl-4-methyl-5-oxo-1,5-dihydro-pyrrol-2-ylidenemethyl)-4-methyl-1H-pyrrol-3-yl)-propionic acid; Mesobilirubin; Mesobilirubin IX a