Patent ID: 7030143

Claim:
A heterocyclic compound of the formula [1], or a pharmaceutically acceptable salt thereof: R 1 -Het-D-E [1] wherein: R 1 is aromatic heterocyclic group; said aromatic heterocyclic group being optionally substituted by the same or different one to three groups selected from alkyl, haloalkyl, trihaloalkyl, alkoxy, halogen and nitro; Het is an oxazole which is optionally substituted by alkyl or trihaloalkyl; D is alkylene, alkenylene, or alkynylene; and E is a group of the formula [3]: wherein Y is oxygen or sulfur; R 3 is hydrogen or alkyl; p is an integer of 0–2; Z is carboxy, alkoxycarbonyl, hydroxymethyl, carbamoyl, N-hydroxycarbamoyl, N-alkylcarbamoyl, N,N-dialkylcarbamoyl, cyano, 1H-5-tetrazolyl, 1-alkyl-5-tetrazolyl, or 2-alkyl-5-tetrazolyl.