Compounds of the general formula (1)
(in which X represents a halogen atom;
R' and R2 respectively represent a hydroxy group and a hydrogen atom, a halogen atom and a hydrogen atom, or a hydrogen atom and a halogen atom; and
R3 and R4, which may be the same or different, represent halogen atoms or hydroxy groups;
at least one of R', R2 and R3 representing a halogen atom; II with the proviso that when R2, R3 and R4 all represent chlorine atoms, X does not represent a chlorine atom).
通式(1)化合物(其中 X 代表卤素原子;R'和 R2 分别代表羟基和氢原子、卤素原子和氢原子或氢原子和卤素原子;R3 和 R4(可以相同或不同)代表卤素原子或羟基;R'、R2 和 R3 中至少有一个代表卤素原子;II 但当 R2、R3 和 R4 均代表
氯原子时,X 不代表
氯原子)。