A compound represented by the formula (I), salt thereof, or hydrate thereof has an excellent anti-pruritic effect and an excellent effect in terms of metabolism. The topical formulation of the present invention has excellent skin absorption properties of the compound represented by the formula (I), salt thereof, or hydrate thereof. Furthermore, the topical formulation of the present invention is excellent in stability because ingredients are hardly bled after long-term storage.
wherein R represents hydroxyl, C1-6 alkoxy optionally substituted with C1-6 alkoxy, or amino optionally substituted with C1-6 alkyl.
化合物(I)的
化学式、其盐或
水合物具有出色的抗瘙痒作用和代谢效果。本发明的局部制剂具有化合物(I)、其盐或
水合物的优异皮肤吸收性能。此外,本发明的局部制剂在长期储存后成分几乎不会流失,因此具有优异的稳定性。其中,R代表羟基、C1-6烷
氧基(可选用C1-6烷
氧基取代)或
氨基(可选用C1-6烷基取代)。