The synthetic medium of optical N acylalanines was N (2,6 xylyl) alanine.It was reacted with 1 menthol and prepared into its menthol esters which were purified by TLC, resolved and determined by HPLC.

光学菌剂的合中间体N-（2，6-二甲苯基）-丙酸与l-薄荷醇在催化剂作用下，生映异构体的薄荷醇酯。