4',5'-Dihydro-antibiotic AX-127B-1, 2'-N-des-&bgr;-lysyl-4',5'- dihydro-antibiotic AX-127B-1, the 4-N-acyl and alkyl derivatives thereof and their pharmaceutically acceptable salts. The compounds are useful as antibiotics and as intermediates for preparing the corresponding 3-O- demethyl derivatives of antibiotic AX-127B-1.
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