Methanimidamide, N'-(8-(((aminocarbonyl)oxy)methyl)-1,1a,2,4,7,8,8a,8b-octahydro-8a-methoxy-5-methyl-4,7-dioxoazirino(2',3':3,4)pyrrolo(1,2-a)indol-6-yl)-N,N-dimethyl-, (1aS-(1aalpha,8beta,8aalpha,8balpha))-