Synonyms: Pterobilin;AC1O6AGW;20890-42-0;21H-Biline-2,18-dipropanoic acid, 8,13-diethenyl-1,19,22,24-tetrahydro-3,7,12,17-tetramethyl-1,19-dioxo-;3-[5-[(E)-[(5E)-5-[[5-[(Z)-[3-(2-carboxyethyl)-4-methyl-5-oxopyrrol-2-ylidene]methyl]-3-ethenyl-4-methyl-1H-pyrrol-2-yl]methylidene]-3-ethenyl-4-methylpyrrol-2-ylidene]methyl]-4-methyl-2-oxopyrrol-3-yl]propanoic acid