A compound represented by the formula below is provided.
(In the formula, X and Y denote a hydroxy group, an amino group, or a halogen atom, and X and Y are groups that are different from each other.)
提供了以下式子所代表的化合物。(在式子中,X和Y代表羟基,
氨基或卤原子,且X和Y是不同于彼此的基团。)