E_iso                   Element isotopes
Iso_mass                Isotope labelled molecular mass
Iso_mz                  Isotope labelled molecular mass
adduct                  Common adducts
contam                  Contaminants in MS
formula                 Get compound formula and structure
mass                    molecular mass
mz                      accurate ion mass
ppm                     mass accuracy
what                    search for m/z in from the idiom metabolomics
                        database
