4880-87-9 N-Acetylnorpronuciferine N-Acetylstepharine Spiro(2,5-cyclohexadiene-1,7'(1'H)-cyclopent(ij)isoquinolin)-4-one, 1'-acetyl-2',3',8',8'a-tetrahydro-5',6'-dimethoxy-, (R)-