Fujirebio Inc.

Yasuko Emoto

Tetsuaki Yamaura

Masato Nishimura

Yasuo Sekine

Yasushi Higashide

Eri Kojima

A naphthoic acid derivative represented by the following general formula or a salt thereof: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are each independently a hydrogen atom, a halogen atom, a hydroxyl group, a lower alkyl group, a lower alkoxy group, a lower alkanoyloxy group, a hydroxy-lower alkyl group, a lower alkoxy-lower alkyl group, a lower alkanoyloxy-lower alkyl group or an aralkyloxy group;

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Sagamihara, Japan

Yasuko Emoto