SMILES: CCC1=C(C(=NC1=O)/C=C\\2/C(=C(/C(=C/C3=C(C(=C(N3)/C=C\\4/C(=C\\C)/C(C(=O)N4)C)C)CCC(=O)O)/N2)CCC(=O)O)C)C
Description: The molecule is a bilin that consists of 8,12-bis(2-carboxyethyl)-18-ethyl-3-ethylidene-2,7,13,17-tetramethyl-2,3-dihydrobilin bearing two oxo substituents at positions 1 and 19. It has a role as a phytochrome chromophore.