Patent ID: 7851473

Claim:
A compound represented by the formula (I): wherein R 1 is a C 6-10 aryl which may be substituted, or a 5- or 6-membered heterocyclic group containing 1 to 4 heteroatoms selected from oxygen, sulfur, and nitrogen atoms in addition to carbon atoms which may be substituted; R 1a is a hydrogen atom; R 2 is piperazin-1,4-diyl which may be substituted; R 3 is a group formed by eliminating two hydrogen atoms from a 1,2,4-thiadiazole, a 1,3-thiazole, a 1,3-oxazole, or a 1,2,4-oxadiazole; and R 4 is a C 6-14 aryl which may be substituted, or a 5- or 6-membered heterocyclic group containing 1 to 4 heteroatoms selected from oxygen, sulfur, and nitrogen atoms in addition to carbon atoms which may be substituted, or a salt thereof, and from which N-Phenyl-4-(3-phenyl-1,2,4-thiadiazol-5-yl)piperazine-1-carboxamide is excluded.