Synonyms: 9-Ethyl-5'-methoxyspiro[7-azatricyclo[5.3.1.0~3,8~]undecane-4,2'-indol]-3'(1'H)-one;8'-ethyl-5-methoxy-2',3',4a',5',6',7',8',8a'-octahydrospiro[indole-2,4'-[1,6]methanoquinolin]-3(1H)-one;(2R,4a'S,6'S,8'R,8a'R)-8'-ethyl-5-methoxy-2',3',4a',5',6',7',8',8a'-octahydrospiro[indole-2,4'-[1,6]methanoquinolin]-3(1H)-one