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.
oxonol VI [ bis(3-propyl-5-oxoisoxazol-4-yl)pentamethine oxanol,bis(3-propyl-5-oxoisoxazol-4-yl)pentamethineoxonol,oxanol VI ] structure given in first source; see also oxonol dyes (isoxazole)