MolE - Molecular Mass Calculator v2.02

Elemental composition: (case sensitive, e.g. C2H3O2Na)

monoisotopic mass
average mass

To change masses: select an element, enter a mass and click on 'put mass'. The user defined element 'X' can be entered the same way. Note that each element has two masses: an average and a monoisotopic mass.
written by Jef Rozenski (1999)