N-benzyl-2,2'alpha-3,3',5',6',7',7alpha,alpha'-octahydro-2-methoxycarbonylspiro(indole-3,3'-pyrrolizidine)-2-one
n-benzyl-2,2'alpha-3,3',5',6',7',7alpha,alpha'-octahydro-2-methoxycarbonylspiro(indole-3,3'-pyrrolizidine)-2-one