Abstract: The structure and component of an unknown mixture need to be investigated before production.The qualitative and quantitative analysis of an unknown mixture were done normally by GC,HPLC,UV,MS,IR and chemical isolation method.In this work,¹³C NMR has been used in determining the structure and component of the unknown mixture with microcomputer searching sadtler data base easily.The chemical names are SUCCINIC ACID,DIMETHYL ESTER,GLUTARIC ACID,DIMETHYL ESTER,ADIPIC ACID,DIMETHYL ESTER,and their content percentages are 22.5%,62.5%,15.0% respectively.The obtained results are in agreement with those of GC-IR method.

Key words: ¹³C NMR, Microcomputer search sadtler data base