Electron ionization mass spectra of bis-(3-methyl-3-undecyl- and 3-pentadecyl-6.S­dimethoxyisochroman-S-yl)methanes  (la-c) and 3-(methyl, undecyl and pentadecyl)-6,S­dimethoxyisochromans (la-c) are studied with the help of LREIMS. The molecular formulae of these compounds are further confimed by HREIMS peak. Matching of molecular ion peaks exhibited by EIMS. 


AAMER SAEED ,MUHAMMAD T HUSSIAN ,NASIM H RAMA ,