Electron ionization mass spectra of 3-propyl-3-methyllisocoumarin (1 and 2), 3-methyl-3, 4-dihydroisocoumarin (5) and realed compounds (3 and 4) are discussed. The mass fragmentation patterns are assigned with the help of LREIMS and HREIMS peak matching of molecularion peaks obtained by EIMS are also given.
N H RAMA ,M T HUSSAIN ,
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