US PATENT SUBCLASS 548 / 204
.~.~.~.~.~.~ The chalcogen, X, is in a -C(=X)- group


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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}
146  DF  .~.~.~ 1,3-thiazoles (including hydrogenated) {7}
202  DF  .~.~.~.~ Plural double bonds between ring members of thiazole ring {1}
203  DF  .~.~.~.~.~ Chalcogen attached indirectly to the thiazole ring by nonionic bonding {2}
204.~.~.~.~.~.~ The chalcogen, X, is in a -C(=X)- group


DEFINITION

Classification: 548/204

(under subclass 203) Compounds wherein the chalcogen, X (i.e., oxygen, sulfur, selenium, or tellurium), is in a group.