Ethyl 2-[(2-oxo-2H-chromen-6-yl)oxy]acetate

Ethyl 2-[(2-oxo-2 H -chromen-6-yl)oxy]acetate, C 13 H 12 O 5 , a member of the pharmacologically important class of coumarins, crystallizes in the monoclinic C 2/ c space group in the form of sheets, within which molecules are related by inversion centers and 2 1 axes. Multiple C—H...O weak hydrogen-bonding interactions reinforce this pattern. The planes of these sheets are oriented in the approximate direction of the ac face diagonal. Intersheet interactions are a combination of coumarin system π–π stacking and additional C—H...O weak hydrogen bonds between ethyl acetoxy groups.