4"- And 3-ester derivatives of DMT and DMOT

4"-Epi erythromycin A and derivatives thereof as useful antibact

4"-Keto-and 4"-amino-4"-deoxy avermectin compounds and substitut

4"-O-Alkylgentamicins and sagamicins

4',5'-Dihydro-antibiotic AX-127B-1; 2'-N-des-.beta.-lysyl-4',5'-

4'-Epi-6'-hydroxyadriamycin and method of use

4'-Iododerivatives of anthracycline glycosides

4-Demethoxy,11-deoxy anthracycline derivatives

4-Demethoxy-4'-deoxydoxorubicin

4-N, 2'-N and 4,2'-Di-N-fortimicin AD derivatives

4-N, 2'-N and 4,2'Di-N-fortimicins AH and AI

4-N,2'-N and 4,2'-Di-N-fortimicin AO derivatives

4-N-.beta.-Lysyl-2'-N-des-.beta.-lysyl antibiotic AX-127B-1 and

4-N-Acyl, 2'-N-acyl and 4,2'-N,N'-diacylfortimicin E derivatives

4-O-(2,3,5-Trideoxy-5-amino-.alpha.-D-pentofuranosy l)-6-O-amino

4a-Substituted avermectin compounds