| 摘要 |
Compounds of formula I <CHEM> wherein P and P1 groups represent hydrogen, alkyl, heteroalkyl, aryl or aralkyl groups, optionally substituted or forming a ring, n is an integer between 0 and 2, m is an integer from l to 3, R1 and R3, that may be the same or different, represent alcoxycarbonyl groups, CN, NO2 or acyl groups, whereas R2 is an aryl group or an heteroaryl group that may be optionally substituted, are useful as active principles of pharmaceutical compositions. |
