Gas-phase fragmentation of protonated piplartine and its fungal metabolites using tandem mass spectrometry and computational chemistry - Silva Junior, E. A. da; Paludo, C. R; Gouvea, D. R; Kato, Massuo Jorge; Furtado, Niege Araçari Jacometti Cardoso; Lopes, Norberto Peporine; Vessecchi, Ricardo; Pupo, Mônica Tallarico (Journal of Mass Spectrometry, 2017)