Radicals substituted by doubly bound oxygen or sulfur atoms or by two such atoms singly bound to the same carbon atom

Full Title

Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms > having the hetero atoms in positions 1 and 3 > not condensed with other rings > with substituted hydrocarbon radicals attached to ring carbon atoms > Radicals substituted by doubly bound oxygen or sulfur atoms or by two such atoms singly bound to the same carbon atom