Accurate MZ is a mass spectrometry tool that allows you to search any compound in the Chemspider database and quickly find the accurate mass of ions that may form through positive and negative ionization, including a number of common adducts.
Accurate MZ also offers in silico fragmentation through Competitive Fragmentation Modelling for Metabolite Identification (http://cfmid.wishartlab.com). This algorithm predicts the MS/MS fragmentation spectra from a chemical structure.
Click the information button in the fragmentation tab for instructions.