| http://www.w3.org/ns/prov#value | - After isolation by column chromatography, the N-protecting groups of both the 4-N-acyl and alkyl derivatives are conveniently removed by the method of U.S. Pat. No. 4,091,032, or by photolysis, by for example, using an ultra violet light and an inert solvent such as ethanol and isolating the products, as the free base or as a salt. 4-N-Acyl derivatives of 4',5'-dihydro antibiotic AX-127B-1 are pre
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