title: L-aspartate of erythromycin A cyclic 11,12-carbonate, a new semisynthetic erythromycin derivative.
abstract: Erythromycin A cyclic 11,12-carbonate, a compound with high antibacterial activity, forms with L-aspartic acid a salt possessing valuable properties as a potential chemotherapeutic agent. The L-aspartate of erythromycin A cyclic 11,12-carbonate exhibits strong anti-bacterial activity, especially against Gram-positive bacteria and shows low toxicity. The serum and the lung tissue levels of the discussed salt after a single dose administration to a rat were measured in comparison with those of erythromycin, its L-aspartate, erythromycin cyclic 11,12-carbonate and its L-glutamate. The new erythromycin derivative showed definitely superior characteristics to those of the other substances tested. The activity of the L-aspartate of erythromycin A cyclic 11,12-carbonate in chemotherapy of experimental staphylococcal infection and experimental pneumococcal bronchopneumonia in mice is superior to that of the parent carbonate and erythromycin itself.
mesh_terms: D000818:Animals; D001419:Bacteria / Q000187:drug effects; D055598:Chemical Phenomena; D002621:Chemistry; D004917:Erythromycin / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology; D005260:Female; D007408:Intestinal Absorption; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D051381:Rats; D013203:Staphylococcal Infections / Q000188:drug therapy; D013290:Streptococcal Infections / Q000188:drug therapy; D013997:Time Factors
chemical_list: D004917:Erythromycin