Novel biphenyl derivatives having a liver trouble-relieving effect, process for their preparation, and liver trouble-relieving agents containing them as effective ingredients. The biphenyl derivatives are represented by formula (I), wherein Ro and R1 each independently represents a lower alkyl group or, then taken together, represent 0=C<, R2 represents a C1-3 alkyl group, and R3 and R4 each represents a hydrogen atom or a lower alkyl group.
具有缓解肝病效果的新型
联苯衍
生物、其制备工艺以及含有它们作为有效成分的缓解肝病制剂。
联苯衍
生物由式(I)表示,其中Ro和R1各自独立地代表一个低级烷基或合在一起代表0=C<,R2代表一个C1-3烷基,R3和R4各自代表一个氢原子或一个低级烷基。