A compound of the formula ##STR1## wherein R.sup.1 is carboxy or protected carboxy, R.sup.2 is hydrogen, hydroxy or protected hydroxy, R.sup.3 is hydrogen, hydroxy, protected hydroxy, etc., R.sup.4 is hydrogen or halogen, A.sup.1 is lower alkylene, A.sup.2 is bond or lower alkylene, --R.sup.5 is ##STR2## (in which R.sup.6 is mono(or di or tri)aryl(lower)alkyl and Z is N or CH), etc., and ##STR3## and a pharmaceutically acceptable salt thereof which are useful as medicaments.
一种
化学式为##STR1##的化合物,其中R.sup.1是羧基或保护的羧基,R.sup.2是氢、羟基或保护的羟基,R.sup.3是氢、羟基、保护的羟基等,R.sup.4是氢或卤素,A.sup.1是较低的烷基,A.sup.2是键或较低的烷基,--R.sup.5是##STR2##(其中R.sup.6是单(或双或三)芳基(较低)烷基,Z为N或CH),等等,以及##STR3##和其药用盐,可用作药物。