Compound 23b

(1S,2R,4aS,13bR,14aS)-Methyl 2-(benzyloxy)-1-(but-3-enoyloxy)-9-methoxy-1,2,3,4,4a,5,7,8,13,13b,14,14a-dodecahydroindolo[2',3':3,4]pyrido[1,2-b]isoquinoline-1-carboxylate

From: A divergent approach to the synthesis of the yohimbinoid alkaloids venenatine and alstovenine