Ion-molecule reactions provide a powerful tool for structural elucidation of ionized pharmaceutical analytes in tandem mass spectrometry. However, all previous interfaces for the introduction of reagents for ion-molecule reactions have utilized a single reagent approach. In this study, a multiported pulsed valve system was designed and characterized for rapid introduction of three neutral reagents into a linear quadrupole ion trap. Additionally, automatic triggering was used to allow for the introduction of the reagents on a chromatographic time scale. This system enables automatic, high throughput screening of complex mixtures by using at least three different ion-molecule reactions. Further, rapid testing of new neutral reagents is also possible.