申请人:Zeneca Limited
公开号:US05760250A1
公开(公告)日:1998-06-02
Compounds of the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are independently hydrogen, halogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, acetoxy or acyl, and processes for preparing the same.
式为##STR1##的化合物,其中R.sup.1、R.sup.2、R.sup.3和R.sup.4独立地表示氢、卤素、C.sub.1-4烷基、C.sub.1-4烷氧基、乙酰氧基或酰基,以及制备这些化合物的方法。