US PATENT SUBCLASS 548 / 239
.~.~.~.~.~ 2-position is unsubstituted or hydrocarbyl substituted only

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548 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {4}
100  DF  .~.~ Hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazoles, etc.) {18}
215  DF  .~.~.~ 1,3-oxazoles (including hydrogenated) {6}
237  DF  .~.~.~.~ One double bond between the ring members of the oxazole ring {2}
239.~.~.~.~.~ 2-position is unsubstituted or hydrocarbyl substituted only

DEFINITION

Classification: 548/239

(under subclass 237) Compounds wherein attached to the ring carbon in the 2-position of the oxazole ring, i.e., the ring carbon between the ring oxygen and the ring nitrogen, is either hydrogen or a hydrocarbon radical only.

(1) Note. Examples of compounds provided herein are: [figure] [figure]