Definition: Azoles with an OXYGEN and a NITROGEN next to each other at the 1,2 positions, in contrast to OXAZOLES that have nitrogens at the 1,3 positions.
parecoxib [ Dynastat,N-(((5-methyl-3-phenylisoxazol-4-yl)-phenyl)sulfonyl)propanamide,N-(((5-methyl-3-phenylisoxazol-4-yl)-phenyl)sulfonyl)propanamine, sodium salt,N-(((Me-P)-P)S)P,Pfizer brand of parecoxib sodium,parecoxib sodium ] structure in first source