Compound Discoverer 3.3 SP2 GC PCI/ MS/MS Tutorial - Compound Discoverer 3.3 SP2 GC PCI/ MS/MS Tutorial - Compound Discoverer Software - Compound Discoverer Software - Thermo Scientific™ Compound Discoverer is a small molecule identification application for GC Orbitrap and high-resolution accurate-mass LC-MS/MS data. This tutorial guides you through the process of setting up a study and an analysis, submitting the analysis to the job queue, reviewing the results of the analysis, and creating a report. The raw data that you are processing was acquired with a GC Orbitrap™ mass spectrometer operated in the positive chemical ionization (PCI) mode.