申请人:Glaxo Group Limited
公开号:US05889178A1
公开(公告)日:1999-03-30
The present invention relates to compounds of formula (IV): ##STR1## wherein R.sup.a and R.sup.b each represent a hydrogen atom or together form an alkylidene group.
本发明涉及化合物的公式(IV):##STR1##其中R.sup.a和R.sup.b分别代表氢原子或共同形成一个烷基亚烯基团。