Sumitomo Dainippon Pharma Oncology, Inc.

Shoukou Ri

Chiang Jia Li

Hitoshi Ban

Seiji Kamioka

Hiroyuki Kitano

Tomoyuki Furuta

This invention provides a compound represented by formula (1) or a pharmaceutically acceptable salt thereof. Specifically, the present invention provides a compound represented by formula (1) or a pharmaceutically acceptable salt thereof [Therein, A is O, S, or N&#x2014;R; ring G is a 5-membered or 6-membered aromatic ring, etc., including 1-3 heteroatoms selected from O, S and N as constituent atoms; Rand Rare each independently a hydrogen atom, a halogen atom, or an optionally-substituted Calkyl carbonyl group, etc.; R, Rand Rare each independently a hydrogen atom, a halogen atom, or an optionally-substituted Calkyl carbonyl group, etc.; and Ris a hydrogen atom or an optionally-substituted Calkyl group, etc.]. 

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Osaka, Japan

Shoukou Ri