Patent ID: 8367843

Claim:
A phenol derivative represented by the following formula (1) wherein R 1 and R 2 are the same or different and represent a lower alkyl group, a lower alkenyl group, a lower alkynyl group, a lower alkoxy group, a haloalkyl group, a haloalkoxy group, an alkylsulfanyl group, an alkylsulfinyl group, an alkylsulfonyl group, a lower alkyl-substituted carbamoyl group, a saturated nitrogen-containing heterocyclic N-carbonyl group, a halogen atom, a cyano group or a hydrogen atom, R 3 represents a lower alkyl group, a haloalkyl group, a halogen atom, a hydroxyl group or a hydrogen atom, and X represents a sulfur atom, —S(═O)— or —S(═O) 2 —, a pharmaceutically acceptable salt thereof, a hydrate thereof or a solvate thereof.