1. The racemate is optically inactive.

2. The S-typed optical isomer is a non-steroidal anti-inflammatory drug, wherein the curative effect is twice of that of the racemate, and the adverse reaction is lower.

3. Pharmacological interactions between the enantiomers may happen when a chiral drug was used as its racemate.

4. Recent research progresses of method of preparation in chiral compound's racemate of amino acids were reviewed in this paper, the possible development future of it was predicted.

5. Pharmacological interactions between the enantiomers may happen when a chiral as its racemate.

6. The conditions and equipment should be shown to be suitable to confirm the stereochemical identity of a racemate or an enantiomer.