The purpose of the present invention is to provide a novel compound that selectively damages cells that have become mesenchymal cells by epithelial-mesenchymal transition. Compounds, etc., represented by formula (I). [In the formula, R1 represents a C1-6 alkyl group, and R2 represents a C1-6 alkoxycarbonyl group, a carboxy group, or a C1-6 alkyl group substituted by a hydroxyl group.]
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