US PATENT SUBCLASS 548 / 238
.~.~.~.~.~ 2-position substituent contains nitrogen, other than as nitro or nitroso

Current as of: June, 1999
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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}
238.~.~.~.~.~ 2-position substituent contains nitrogen, other than as nitro or nitroso

DEFINITION

Classification: 548/238

(under subclass 237) Compounds wherein the substituent attached to the ring carbon in the 2-position, i.e., the ring carbon between the ring oxygen and the ring nitrogen, contains nitrogen, except as a member of the nitro (-NO2) or nitroso (-NO) group.