4-(4-Nitrophenyl)morpholin-3-one (aka 4-(3-Oxo-4-morpholinyl)nitrobenzene) is a pharmaceutical intermediate typically used in the preparation of Rivaroxaban, as an anticoagulant medication (blood thinner), in treatment of blood clots, specifically deep vein thrombosis and pulmonary emboli.
Practical and efficient processes for the preparation of 4-(4-aminophenyl)morpholin-3-ones on a larger scale: Precursor of factor Xa inhibitors. 
Oral, direct factor Xa inhibitors in development for the prevention and treatment of thromboembolic diseases. 
Rivaroxaban as an oral anticoagulant for stroke prevention in atrial fibrillation. 
 W.W.K.R. Mederski, et al, Heterocycles, 2007, 74(C), pp 437-445.