2-Morpholinone,5-phenyl-, (5R)- , its CAS NO. is 121269-45-2, the synonyms are (5R)-3,4,5,6-Tetrahydro-5-phenyl-2(h)-1,4-oxazin-2-one ; (Rr)-3,4,5,6-Tetrahydro-5-phenyl-4(h)-1,4-oxazin-2-one ; R-5-phenyl-morpholin-2-one .