High-level ab initio atomisation energy calculations have been carried out to rank a number of 'known' C 2 H 5 NO neutral molecules from the most stable, acetamide, to the least, methoxy methyl imidogen. Additionally dipole moments and adiabatic ionisation energies are reported and compared to the literature -what little of it exists. Higher energy species incorporating more diverse types of bonding than the traditional tetravalent carbon, trivalent nitrogen and divalent oxygen are also documented.