33889-22-4 B-2847-R L-erythro-Hexopyranose, 2,3,4,6-tetradeoxy-4-((5,6,11,12,13,14,15,16,16a,17,17a,18,21,22-tetradecahydro-2,12,14,16,26-pentahydroxy-10-methoxy-3,6,11,13,15,20-hexamethyl-5,18,21-trioxo-10H-4,6-epoxy-1,23-methenobenzo(d)cycloprop(n)(1,9)oxaazacyclotetracosin-25-yl)amino)-, 12-acetate Tolypomycin R Tolypomycin Y, 1,4-didehydro-1-deoxo-4,35-dihydro-1-hydroxy-