A PGD
2
receptor antagonist such as a compound of the formula (IA-a-5):
1
a pharmaceutical acceptable salt thereof or a hydrate thereof, has an efficacious activity for the prevention or treatment of itching and is useful as a medicament.
一种
PGD2受体拮抗剂,例如公式(IA-a-5)的化合物:1a其医药上可接受的盐或其
水合物,具有预防或治疗瘙痒的有效活性,并可用作药物。