Compounds represented by the following general formula (I) wherein ring A
is benzene, cyclohexane, pyridine, piperidine, a derivative thereof,
imidazole, a derivative thereof, etc.; the ring B represents benzene,
cyclohexane, pyrrole or a derivative thereof, furan, thiophene, etc.;
R.sup.1, R.sup.2 and R.sup.3 represent each hydrogen, alkyl, halogen,
hydroxyl, alkoxy, etc.; W represents hydrogen, alkyl or
hydroxycarbonylalkyl; X represents halogen, cyano, nitro, etc.; X'
represents hydrogen, halogen, etc.; and Y represents alkyl, hydroxyalkyl,
hydroxycarbonylalkyl, aminoalkyl, etc.; salt thereof, and drugs
comprising these compounds. Because of having an exellent effect of
inhibiting activated lymphocyte proliferation, these compounds are
usefull as preventives or remedies for various autoimmune diseases.
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