8a-aza-8a-homoertyhromycin cyclic lactams
8a-aza-8a-homoerythromycin cyclic iminoethers
8beta-substituted ergolines, process for their production...
8beta-vinyl-11beta-(alpha-substituted)alkyl-estra-1,3,5(10)-...
8h-indeno ¬ 2,1-b| thiophen-2-oxaminic acids and esters thereof