What is "munchnone"

n. (context organic chemistry English) Any of a class of mesoionic 1,3-oxazoles having an oxygen atom attached to position 5

Münchnone (synonyms: 1,3-oxazolium-5-oxide; 1,3-oxazolium-5-olate; anhydro-5-hydroxy-1,3-oxazolium hydroxide; 5-hydroxy-1,3-oxazolium hydroxide, inner salt; oxido-oxazolium) is a mesoionic heterocyclic aromatic chemical compound.