申请人:FUJISAWA PHARMACEUTICAL CO., LTD.
                            
                            
                                公开号:EP0289911A2
                            
                            
                                公开(公告)日:1988-11-09
                            
                            
A compound of the formula :
 wherein
    R¹ is hydrogen or an acyl group,
    R² is an acyl group,
    R³ is carboxy(lower)alkyl, lower alkyl substituted with carboxy and one or more halogen atom(s), protected carboxy(lower)alkyl, carboxyaryl, protected carboxyaryl, carboxy, protected carboxy, hydroxy(lower)alkyl, sulfino(lower)alkyl, phosphono(lower)alkyl, protected phosphono(lower)alkyl or halo(lower)alkyl,
    R⁷ is hydrogen or lower alkyl, and
    A is
 (in which R⁸ is hydrogen or lower alkyl),
and a pharmaceutically acceptable salt thereof, processes for its preparation and pharmaceutical compositions comprising them. The invention also relates to intermediates of the formula
 and process for production thereof.  
                            式中的化合物
 其中
R¹ 是氢或酰基、
R² 是酰基
R³ 是羧基(低级)烷基、被羧基和一个或多个卤原子取代的低级烷基、受保护的羧基(低级)烷基、羧基芳基、受保护的羧基芳基、羧基、受保护的羧基、羟基(低级)烷基、亚磺酰基(低级)烷基、膦酰基(低级)烷基、受保护的膦酰基(低级)烷基或卤代(低级)烷基、
R⁷ 是氢或低级烷基,以及
A 是
 (其中 R⁸ 是氢或低级烷基)、
及其药学上可接受的盐、制备工艺和包含它们的药物组合物。本发明还涉及式
 及其生产工艺。