申请人:Kabushiki Kaisha Toshiba
公开号:US04976887A1
公开(公告)日:1990-12-11
A compound represented by formula: ##STR1## In the formula, Ar represents ##STR2## and each of Ra and Rb independently represents an optically non-active alkyl group or an optically active group having an asymmetric carbon atom. Either Ra or Rb is the optically active group. X represents ##STR3## Each of l and m represents 0 or 1.
一种化合物的化学式为:##STR1## 公式中,Ar代表##STR2## Ra和Rb分别独立表示为无光学活性的烷基或具有不对称碳原子的光学活性基团。Ra或Rb中的一个是光学活性基团。X代表##STR3## l和m各自表示为0或1。