US PATENT SUBCLASS 548 / 122
.~.~.~ The five-membered hetero ring consists of sulfur, oxygen, nitrogen, and carbon

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}
122.~.~.~ The five-membered hetero ring consists of sulfur, oxygen, nitrogen, and carbon

DEFINITION

Classification: 548/122

(under subclass 100) Compounds wherein the five-membered hetero ring includes at least one atom each of sulfur, oxygen, nitrogen, and carbon and contains no other elements as ring members.

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