Crassanine

(2ξ,4ξ,5ξ,6ξ,18ξ)-Conopharyngine oxindole

8'-Ethyl-1,2,2',3',6',7',8',8'a-octahydro-5,6-dimethoxy-2-oxospiro[3H-indole-3,4'-[4H-1,6]methanoquinoline]-4'a(5'H)-carboxylic acid methyl ester