Abstract: Study on Mass Spectrometry of Griseofulvin and Its Metabolit in Rabbit UrineYu Zhili(Institute of Medicinal Biotechnology,Chinese Academy of Medical Scienes,Peking Union Medical College,Beijing 100050, China)Abstract:The EI mass spectra of griseofulvin and its metabolit(6-O-dMG)in rabbit urine were reported.Their mass spectra fragmentations were decribed on the basis of high resolution mass spectrometry in the paper.Keywords:griseofulvin,metabolit,fragmentation