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