IUPAC:methyl (2E)-2-[(3S,6'S,7'S,8'aS)-6'-ethyl-2-oxo-1,2,3',5',6',7',8',8'a-octahydro-2'H-spiro[indole-3,1'-indolizin]-7'-yl]-3-methoxyprop-2-enoate
IUPAC:methyl (2E)-2-[(3S,6'S,7'S,8'aS)-6'-ethyl-2-oxo-1,2,3',5',6',7',8',8'a-octahydro-2'H-spiro[indole-3,1'-indolizin]-7'-yl]-3-methoxyprop-2-enoate