(S)-(+)-4-Isopropyl-3-propionyl-2-oxazolidinone ,its CAS NO. is 77877-19-1,the synonyms is (s)-4-Isopropyl-3-propionyl-2-oxazolidinone ; (s)-3-Propionyl-4-isopropyl-2-oxazolidinone ; n-Propionyl-(4s)-isopropyl- 2-oxazolidinone ; (s)-(+)-4-Isopropyl-3-propimyl-2-oxazolidimone ; (s)-(+)-4-Isoprpyl-3-propionyl-2-oxazolidinone .