from 2 to 10 atoms other than hydrogen which are carbon, oxygen, nitrogen and sulfur, generally having from 0 to 1 sites of aliphatic unsaturation, usuallyethylenic, and wherein oxygen will be present normally solely bonded to carbon i.e. ether or non-oxocarbonyl, nitrogen will be present as amido or tertiary-amino, and sulfur will be present as thioether or thiono; usually only oxygen and nitrog