| 摘要 |
Compounds of formula (I) are disclosed, wherein R<1> is hydrogen or acyl, R<2> is hydrogen, hydroxy, alkoxy or acyloxy, R<3> is (C3-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, R<5> is hydrogen and R<6> is hydroxy or methoxy, or R<5> and R<6> 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. |
