Desdimethylaminoaureomycin (IV) and desdimethylaminodesoxyaureomycin (Ⅴ), when subjected to catalytic hydrogenation, yield deschlorodesdimethylaminoaureomycin (Ⅶ) and deschlorodesdimethylaminodesoxyaureomycin (Ⅷ) respectively. On warming with methanolic hydrogen chloride, Ⅶ and VIII give their corresponding anhydro-compounds: deschlorodesdimethylaminoanhydroaureomycin (Ⅹ) and deschlorodesdimethylaminodesoxy-anhydroaureomycin (Ⅺ).