| 摘要 |
<p>Compounds of formula (I) are disclosed, wherein R1 is hydrogen or acyl, R2 is hydrogen, hydroxy, alkoxy or acyloxy, R3 is (C¿3?-C7)alkyl, aryl(C2-C7)alkyl, protected carboxy(C2-C7)alkyl, 1-(C3-C7)alkenyl, aryl-1-(C2-C7)alkenyl or protected carboxy-1-(C2-C7)alkenyl, R?4¿ is hydroxy or alkoxy, R5 is hydrogen and R6 is hydroxy or methoxy, or R?5 and R6¿ are combined to form oxo, A is methylene, hydroxymethylene or carbonyl, n is an integer of 1 or 2, and the symbol of a line and dotted line is a single bond or a double bond and salts thereof. And processes for their production, and pharmaceutical compositions containing them are also described.</p> |
