title: Chemical ionization mass spectrometry of valepotriates using isobutane as reactant gas.
abstract: A series of known valepotriates isolated from some VALERIANA species and their transformation products have been studied by CIMS (isobutane). The compounds have been characterized by molecular and protonated molecular ions and some typical fragments. Some information about the location of the acyloxy substituents, especially as regards monoene valepotriates, has been obtained.
authors.affiliation: Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria.
authors.forename: N V
authors.initials: NV
authors.lastname: Handjieva
authors.forename: N N
authors.initials: NN
authors.lastname: Mollova
authors.forename: S S
authors.initials: SS
authors.lastname: Popov