Abstract: Mass Spectral Fragmentation of Long Chain Carboxide Compounds and Calculation of the Molecular FormulaAuthor Yu Zhili,Wang Yanyun(Institute of Medicinal Biotechnology,Chinese Academy of Medical Sciences and Peking Union Medical College,Beijing 100050,China)Received 19960903 Abstract The mass spectral fragmentation of long chain carboxide compounds was discussed and calculation of molecular formula was proposed in the paper.Key Words:fragmentation ,carboxide compound,calculation of molecular formula