Vitzthum, O. G. published the artcileOxazoles and thiazoles in coffee aroma, Product Details of C5H7NO, the publication is Journal of Food Science (1974), 39(6), 1210-15, database is CAplus.
Twenty oxazoles and 23 thiazoles not previously reported as constituents of roasted coffee were identified by a combination of glass capillary gas chromatog. and mass spectrometry. Roasted coffee volatiles were isolated using atm. steam distillation The enrichment of steam volatiles was carried out on Porapak Q by organic solvent extraction and separation of the organic phase into basic and neutral fractions.
Journal of Food Science published new progress about 20662-83-3. 20662-83-3 belongs to oxazolidine, auxiliary class Oxazole, name is 4,5-Dimethyloxazole, and the molecular formula is C9H10O4, Product Details of C5H7NO.
Referemce:
https://en.wikipedia.org/wiki/Oxazolidine,
Oxazolidine | C3H7NO – PubChem