4-Hydroxy-1-(4-hydroxy-3,7-dimethoxy-17-methyl-6-oxo-7,8-didehydromorphinan-1-yl)-3,7-dimethoxy-17-methyl-7,8-didehydromorphinan-6-one 2,3-dihydroxysuccinate AIDS-156221 AIDS156221 NSC298229