3-{(2Z)-2-{[3-(2-carboxyethyl)-5-{(Z)-[(3E,4S)-3-ethylidene-4-methyl-5-oxopyrrolidin-2-ylidene]methyl}-4-methyl-1H-pyrrol-2-yl]methylene}-4-methyl-5-[(Z)-(3-methyl-5-oxo-4-vinyl-1,5-dihydro-2H-pyrrol-2-ylidene)methyl]-2H-pyrrol-3-yl}propanoic acid
3-{(2z)-2-{[3-(2-carboxyethyl)-5-{(z)-[(3e,4s)-3-ethylidene-4-methyl-5-oxopyrrolidin-2-ylidene]methyl}-4-methyl-1h-pyrrol-2-yl]methylene}-4-methyl-5-[(z)-(3-methyl-5-oxo-4-vinyl-1,5-dihydro-2h-pyrrol-2-ylidene)methyl]-2h-pyrrol-3-yl}propanoic acid