| abstract |
This invention relates to the substance of the following general formula (I).n n n [Formula I]n n n n n n n n In the above formula, R 1 , R 2 and R 3 are the same as or different from each other in each case, and are hydrogen atom, halogen atom, hydroxy group, nitro group, cyano group or monovalent selective substituted organic radical, and R 4 is hydrogen atom, halogen Atom, nitro group, cyano group or monovalent selective substituted organic radical, R 5 is the same or different, halogen atom, hydroxy group, nitro group, cyano group or monovalent selective substituted organic radical. |