| 摘要 |
<p>Erythromycin antibiotics of the formula: …<CHEM>… and their pharmaceutically acceptable acid addition salts, wherein R is hydrogen, alkanoyl having two or three carbon atoms and ethyl succinyl: R1 and R2 when considered separately are, respectively, hydroxy and hydrogen; R1 and R2 when considered together are an oxo group; R3 and R4 when considered separately are each hydrogen; and R3 and R4 when considered together are @C = O; processes for their preparation, and pharmaceutical compositions containing them.</p> |
