Kanegafuchi Chemical Industry Co., Ltd.

Kiyoto Ishii

Kiyoshi Watanabe

Hajime Kawaharada

Mikio Kitahara

Novel 7-hydroxyguanine compounds of the formula: ##STR1## wherein R is hydrogen atom or hydroxy, and a salt thereof, which have excellent anti-tumor activity, process for preparing the compounds, and anti-tumor agent containing said compound as an active ingredient.

7-hydroxyguanine compounds, process for preparing said compounds, and

Novel 7-hydroxyguanine compounds of the formula: ##STR1## wherein R is hydrogen atom, tetrahydropyranyl group or tetrahydrofuryl group, and R.sub.2 is hydrogen atom, tetrahydropyranyl group or tetrahydrofuryl group, provided that when R.sub.1 is hydrogen atom, R.sub.2 is tetrahydropyranyl group or tetrahydrofuryl group, and a salt thereof, which have excellent anti-tumor activity, process for preparing the compounds, and anti-tumor agent containing said compound as an active ingredient.

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Akashi, Japan

Kiyoto Ishii