Patent ID: 8822383

Claim:
A compound represented by the formula: wherein R 1 , R 2 , R 3 , R 4 , and R 5 are the same or different and each represents a hydrogen atom, a halogen atom, a lower alkyl group, or a lower alkoxy group, or R 1 and R 2 are linked together to form a lower alkylenedioxy group, or R 1 and R 2 together with the adjacent carbon atoms form a benzene ring, or R 2 and R 3 are linked together to form a lower alkylenedioxy group, or R 2 and R 3 together with the adjacent carbon atoms form a benzene ring, R 6 represents a hydrogen atom or a lower alkyl group, X and Y are the same or different and each represents an oxygen atom and a sulfur atom, and n represents an integer of 0, 1 or 2.