Analgesic composition of pyrazolo(1,5-A) pyrimidines

摘要

PCT No. PCT/JP96/02759 Sec. 371 Date May 21, 1997 Sec. 102(e) Date May 21, 1997 PCT Filed Sep. 24, 1996 PCT Pub. No. WO97/11946 PCT Pub. Date Apr. 3, 1997The invention provides an analgesic composition containing as an active ingredient a specific pyrimidine derivative represented by one of the follwing formulas (1) to (3): <IMAGE> (1) <IMAGE> (2) <IMAGE> (3) wherein the substituents are as defined herein. This composition exhibits potent analgesic activity and is effective for alleviating various types of pain such as postoperative pain.