... Acknowledge- ment is made to Miss Evelyn Wallenwein for very skillful technical assistance. Table 4. Partial mass spectra of compounds 13-16 Rel. int. ... R. Wittowski, M. Kellert and W. Baltes, lnt. J. Mass Spec- 22. ... 618 ORGANIC MASS SPECTROMETRY, VOL. 20, NO. 10, 1985