methyl (3aS,3bS,9bS)-4-{3-[1,2-di(tert-butoxycarbonyl)-3-(3-methylbut-2-enyl)guanidino]propyl}-1,5-bis(trifluoroacetyl)-2,3,3a,4,5,9b-hexahydro-4-(3-hydroxypropyl)-1H-pyrrolo[3,2-c]quinoline-8-carboxylate