US PATENT SUBCLASS 549 / 89
.~.~.~.~ Plural ring hetero atoms in the hetero ring


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549 /   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) {2}
1  DF  .~.~ Sulfur containing hetero ring (e.g., thiiranes, etc.) {9}
88  DF  .~.~.~ The hetero ring is four-membered {1}
89.~.~.~.~ Plural ring hetero atoms in the hetero ring


DEFINITION

Classification: 549/89

(under subclass 88) Compounds wherein the hetero ring contains at least one ring hetero atom in addition to ring sulfur.

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