Patent ID: 8809304

Claim:
A compound represented by the following formula (I) or a pharmaceutically acceptable acid addition salt thereof, wherein R is a hydrogen atom or P(═O)(OH) 2 , X is an oxygen atom or a sulfur atom, Y is CH 2 CH 2 or CH═CH, and wherein R 1 is cyano, R 2 is alkyl having a carbon number of 1 to 4 and optionally substituted by a hydroxyl group(s) or a halogen atom(s), R 3 and R 4 may be the same or different and each is a hydrogen atom or alkyl having a carbon number of 1 to 4, and n is 5-8, or wherein R 1 is difluoromethyl or trifluoromethyl, R 2 is methyl optionally substituted by a hydroxyl group(s) or ethyl optionally substituted by a hydroxyl group(s), R 3 and R 4 each is a hydrogen atom and n is 6 or 7.