(n) :
(organic chemistry) Any of a class of unsaturated heterocyclic compounds containing a ring of five carbon atoms, an oxygen atom and two double bonds; especially the simplest one, C₅H₆O.
(n) :
(organic chemistry) Any of a class of unsaturated heterocyclic compounds containing a ring of five carbon atoms, an oxygen atom and two double bonds; especially the simplest one, C₅H₆O.