Japan Energy Corporation

Nobuyoshi Chiba

Yoshiaki Isobe

Haruo Takaku

Kohsaku Hirota

Hiroyuki Morita

Hironao Sajiki

Haruhisa Ogita

Yuso Goto

Hiroyuki Matsui

Hideharu Sato

Harumi Satoh

Yoichi Ohba

Purine derivative

The present invention relates to a pyrazole derivative represented by formula (I) or (II) ##STR1## wherein R.sup.1 is hydrogen C2-C6 alkyl benzyl or phenyl; each of R.sup.2 and R.sup.3 is hydrogen, C1-C6 alkyl or benzyl; each of R.sup.4 and R.sup.5 is hydrogen, C1-C6 alkyl, C3-C6 alkenyl, C3-C8 cycloalkyl, benzyl or phenyl;

Pyrazole derivatives and their pharmaceutical use

Purine derivatives shown by general formula [I] or pharmacologically acceptable salts thereof. Suppressants for inflammatory diseases containing an effective ingredient of said purine derivative. ##STR1## (wherein, R represents one group selected from the groups composed of H atom, a straight chain alkyl group having 1-10 carbon atoms, a branched chain alkyl group having 3-10 carbon atoms, an alkyl group having 1-10 carbon atoms substituted with one carboxyl group, 4-carboxybenzyl group and phenethyl group). Above mentioned purine derivatives prevent the tissue damages due to mediators such as active oxygen and TXA.sub.2 in the initial stage of inflammation, and prevent the subsequent aggravation of inflammatory responses due to the adhesion of activated leukocytes to the cells in the lesion, and exhibit efficacy as anti-inflammatory drugs in all stages of inflammatory diseases caused by leukocytes.

Purine derivatives and suppressants for inflammatory diseases

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Saitama, Japan

Nobuyoshi Chiba