| abstract |
A compound of the formula (I), R1 is a group of formula -Y1-Y2-Y3-Ra (Y1 is a single bond etc.; Y2 is -C(=O)-NH- etc.; Y3 is an optionally substituted aryl group etc.) etc.; R2 is H etc.; R3 is an alkyl group etc.; R4 is an alkyl group etc.; R5 is an optionally substituted alkyl group etc.; or R4 and R5 together with the adjacent atom to form a ring etc.), or the prodrug, the pharmaceutically acceptable salt or the solvate thereof having an affinity effect for cannabinoid 2 type receptor is disclosed. |