Nippon Zoki Pharmaceutical Co., Ltd.

Kouichiro Go

Norihiko Kitamura

Yoshiyuki Kurimoto

Akio Namimatsu

Antiallergic substances, are evaluated by measuring the amount of nasal secretion quantitatively using experimental animal models with nasal mucosal hypersensitivity.

Method for evaluating antiallergic substances

The present invention relates to a novel pyrido[2,3-d]pyrimidine derivative having the formula (I): ##STR1## wherein each of R.sub.1 and R.sub.2, which may be the same or different, is a lower alkyl group; and each of R.sub.3 and R.sub.4, which may be the same or different, is hydrogen, halogen, hydroxy, nitro, amino, hydroxyamino, hydrazino, azido, a lower alkenylamino group or a lower alkylamino group which may optionally have hydroxy; and pharmaceutically acceptable salt thereof. These compounds are useful as anti-allergic agents, for example, for the treatment of bronchial asthma, urticaria, allergic rhinitis, allergic dermatoses or allergic conjunctivitis.

5-substituted pyrido[2,3-d]pyrimidine-2,4-diones

The present invention relates to a novel pyrido[4,3-d]pyrimidine derivative having the formula (I): ##STR1## wherein each of R.sub.1 and R.sub.2, which may be the same or different, is a lower alkyl group; R.sub.3 is hydrogen, halogen, hydroxy, amino, hydroxyamino, imino, hydrazino or a lower alkylamino group which may optionally have hydroxy, amino or a lower alkylamino group; and R.sub.4 is hydrogen, amino, --NH.sup..crclbar. or a lower alkyl group which may optionally have hydroxy, amino or a lower alkylamino group; and pharmaceutically acceptable salt thereof. These compounds are useful as anti-allergic agents, for example, for the treatment of bronchial asthma, urticaria, allergic rhinitis, allergic dermatoses or allergic conjunctivitis.

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Hyogo, Japan

Kouichiro Go