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.)
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.)