US PATENT SUBCLASS 548 / 218
.~.~.~.~.~ At least three ring hetero atoms in the polycyclo ring system

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}
217  DF  .~.~.~.~ Polycyclo ring system having the oxazole ring as one of the cyclos {6}
218.~.~.~.~.~ At least three ring hetero atoms in the polycyclo ring system

DEFINITION

Classification: 548/218

(under subclass 217) Compounds wherein the polycyclo ring system contains at least one ring hetero atom in addition to the ring oxygen and ring nitrogen of the oxazole ring.

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