1-Phenylpyrazole compounds of the formula (1): ##STR1## which is exemplified by 5-amino-1-(3-cyano-4-isobutoxyphenyl)pyrazole-4-carboxylic acid, an optical isomer thereof and a pharmaceutically acceptable salt thereof. These compounds have a xanthine oxidase inhibitory activity and are useful as therapeutic agents for diseases such as hyperuricacidemia and gout.
A compound having a xanthine oxidase inhibitory activity, such as 1-(3-cyano-4-neopentyloxyphenyl)pyrazole-4-carboxylic acid and the like, can be a drug for preventing cancer including colon cancer and the like, as an agent for suppressing tumorigenesis.
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. ##STR00001##
