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3-Ethyl-3,4,4a,10a-tetrahydro-2H-1,5-dioxa-3-aza-phenanthren-6-one(C_(13)H_(13)NO_3,M_r=231.24)was synthesized and characterized by FT-IR,~1H NMR spectra,and thermal analysis.The crystal structure was determined by X-ray single-crystal diffraction.It crys