METHYL (.ALPHA.E,1'S,6'S,7'S,8'AS)-6'-ETHYL-1,2',3,3',6',7',8',8'A-OCTAHYDRO-4-HYDROXY-.ALPHA.-(METHOXYMETHYLENE)-3-OXOSPIRO(2H-INDOLE-2,1'(5'H)-INDOLIZINE)-7'-ACETATE
methyl (.alpha.e,1's,6's,7's,8'as)-6'-ethyl-1,2',3,3',6',7',8',8'a-octahydro-4-hydroxy-.alpha.-(methoxymethylene)-3-oxospiro(2h-indole-2,1'(5'h)-indolizine)-7'-acetate