Abstract: A [5-chloro-6-phenyl-2-(4-trifluoromethylphenyl)-4-pyrimidinyl-amino]acetamide derivative of the formula (I): wherein R1 is a methyl group or a cyclopropyl group, and a pharmaceutical composition containing the same. Said compounds exhibit a potent anti-rheumatoid activity and show low toxicity, and hence, they are useful as an agent for prophylaxis or treatment of immuno inflammatory diseases such as rheumatoid diseases (e.g., rheumatoid arthritis, Behcet disease, ankylosing spondylitis, etc.) and autoimmune diseases (e.g., multiple sclerosis, systemic lupus erythematosus, Sjögren syndrome, etc.).

Abstract: 2-Aryl-8-oxodihydropurine derivative of the following formula (I): wherein W is H, lower alkyl, halogen, lower alkoxy, amino, mono- or di-lower alkylamino, or substituted or unsubstituted phenyl; X is H, lower alkyl, cycloalkyl-lower alkyl, substituted or unsubstituted phenyl-lower alkyl, lower alkenyl, carbamoyl, di-lower alkylcarbamoyl, or a group of the formula (Q): —CH(R3)CON(R1)(R2); Y is H, lower alkyl, cycloalkyl, cycloalkyl-lower alkyl, lower alkenyl, substituted or unsubstituted phenyl-lower alkyl, or a group of the formula (Q): —CH(R3)CON(R1)(R2); A is substituted or unsubstituted phenyl, or substituted or unsubstituted heteroaryl; provided that when one of X and Y of the above formula (I) is the group of the formula (Q), then the other is the same groups for X or Y as described above except for the group of the formula (Q), or a pharmaceutically acceptable acid addition salt thereof.

Abstract: An acetamide derivative of the formula (I): ##STR1## wherein X is --0-- or --NR.sub.4 --, R.sub.1 is H, lower alkyl, lower alkenyl or cyclolalkyl-lower-alkyl, R.sub.2 is lower alkyl, cycloalkyl, substituted or unsubstituted phenyl, etc., R.sub.3 is H, lower alkyl or hydroxy-lower alkyl, R.sub.4 is H, lower alkyl, etc., R.sub.5 is H, lower alkyl, lower alkenyl, hydroxy-lower alkyl, etc., R.sub.6 is H, lower alkyl, CF.sub.3, substituted or unsubstituted phenyl, or R.sub.5 and R.sub.6 may optionally combine to form --(CH.sub.2)n--, R.sub.7 is H, halogen, lower alkyl, lower alkoxy, CF.sub.3, OH, NH.sub.2, etc., R.sub.8 is H, halogen, lower alkyl or lower alkoxy, or a pharmaceutically acceptable acid addition salt thereof. The compounds of the present invention selectively act on the peripheral-type BZ.omega..sub.