| 摘要 |
<p>A compound of the formula <CHEM> wherein R<1> is amino or a protected amino group, R<2> is hydrogen or an organic group, R<3> is hydrogen, lower alkyl, hydrory(lower)alkyl, protected hydroxy(lower)alkyl, amino(lower)alkyl, protected amino(lower)alkyl, carbamoyl(lower)alkyl, N,N-di(lower)alkylcarbamoyl(lower)alkyl or an imino protective group, R<4> is hydrogen, lower alkyl, carboxy, protected carboxy, amino,protected amino or carbamoyl, and Z is N or CH, and a pharmaceutically acceptable salt thereof, processes for their preparation and pharmaceutical compositions comprising them as an active ingredient in admixture with pharmaceutically acceptable carriers. The invention also relates to intermediates of the formula <CHEM> and processes for their preparation. n</p> |
