A systematic investigation of the fragmentation pattern of two furanoheliangolide C-8 stereoisomers using electrospray ionization mass spectrometry - Sartori, Lucas Rossi; Vessecchi, Ricardo; Humpf, Hans-Ulrich; Costa, Fernando Batista da; Lopes, Norberto Peporine (Rapid Communications in Mass Spectrometry, 2014)