. . "Dioscorine" . . . . "Dioscorine" . . . . . . . . "dioscorine" . . . . . . "(1R,2S,4R)-4\u2032,8-Dimethyl-8-azaspiro[bicyclo[2.2.2]octane-2,2\u2032-pyran]-6\u2032(3\u2032H)-one" . . . . . . . .