US PATENT SUBCLASS 546 / 272.1
.~.~.~.~.~ 1,2-oxazoles (including hydrogenated)

Current as of: June, 1999
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546 /   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) {1}
1  DF  .~.~ Hetero ring is six-membered consisting of one nitrogen and five carbons {24}
268.1  DF  .~.~.~ Additional hetero ring containing {4}
268.4  DF  .~.~.~.~ The additional hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen {9}
272.1.~.~.~.~.~ 1,2-oxazoles (including hydrogenated)

DEFINITION

Classification: 546/272.1

1,2-oxazoles (including hydrogenated):

(under subclass 268.4) Compounds in which the five-membered hetero ring has oxygen in the 1-position, nitrogen in the 2-position, and carbons in the remaining three positions.

(1) Note. This subclass provides for compounds containing the following ring which may have double bonds between its members: [figure]