| abstract |
The object is to provide a safe and highly effective prophylactic or ameliorating agent for psoriasis in the skin. Thus, provided is a prophylactic or ameliorating agent for psoriasis in the skin, which comprises a compound represented by the general formula (I) or a salt thereof as an active ingredient. (I) wherein R1, R2 and R3 independently represent a lower alkyl, a lower alkenyl, a lower alkynyl, an aralkyl, an araryl, a phenyl or a hydrogen atom. |