def permethylated_molecular_weight(self,adduct='C2H6O'): return self.permethylated_elemental_composition().mass(elmt) + \ Composition.fromstr(adduct).mass(elmt)
def underivitized_molecular_weight(self,adduct='H2O'): return self.native_elemental_composition().mass(elmt) + \ Composition.fromstr(adduct).mass(elmt)