ই-মেইল নথি: The crystal structures of two new coumarin derivatives: 2-(4-{2-[(2-oxo-2H-chromen-4-yl)­oxy]acet­yl}piperazin-1-yl)acetamide and N-(2,4-di­meth­oxy­benz­yl)-2-[(2-oxo-2H-chromen-4-yl)­oxy]acetamide

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