Choose a variety of starting materials, such as different aromatic aldehydes, various ketones, and appropriate reagents, to generate a diverse library of coumarin derivatives.
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5-hydroxy-7-methyl-4-(3,4,5-trimethoxyphenyl)chromen-2-one
7-aza-3,11-dithiadispiro[5.1.5.3]hexadecane-15-one
3-Nitro-2-(pyridin-2-yl)pyridine
