allyl 3-{(Z)-2-({(E)-8-(3-allyloxy-3-oxopropyl)-3-ethyl-9-methyl-2-oxo-1,2,4,5-tetrahydrodipyrrolo[1,2-a:2',3'-d]azepin-7-yl}methylene)-4-methyl-5-[(Z)-(4-methyl-5-oxo-3-vinyl-1H-pyrrol-2(5H)-ylidene)methyl]-2H-pyrrol-3-yl}propanoate