US PATENT SUBCLASS 548 / 117
.~.~.~.~.~ The five-membered hetero ring contains chalcogen as a ring hetero atom

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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}
112  DF  .~.~.~ Phosphorus attached indirectly to the five-membered hetero ring by nonionic bonding {4}
116  DF  .~.~.~.~ The five-membered hetero ring and phosphorus are both bonded directly to the same chalcogen {2}
117.~.~.~.~.~ The five-membered hetero ring contains chalcogen as a ring hetero atom

DEFINITION

Classification: 548/117

(under subclass 116) Compounds wherein the five-membered hetero ring contains chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) as a ring hetero atom.

(1) Note. An example of a compound provided for herein is: [figure]