US PATENT SUBCLASS 548 / 315.1
.~.~.~.~.~ The additional hetero ring contains sulfur as the only ring hetero atom [e.g., 5-(2-thienyl) hydantoin, etc.]

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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}
300.1  DF  .~.~.~ 1,3-diazoles (including hydrogenated) {9}
311.1  DF  .~.~.~.~ Additional hetero ring attached directly or indirectly to the diazole ring by nonionic bonding (e.g., 1,3-dioxolan-2-yl methyl-imidazole, etc.) {5}
315.1.~.~.~.~.~ The additional hetero ring contains sulfur as the only ring hetero atom [e.g., 5-(2-thienyl) hydantoin, etc.]

DEFINITION

Classification: 548/315.1

(under subclass 311.1) Compounds wherein sulfur is the only ring hetero atom in the additional hetero ring.

(1) Note. This subclass contains, for example: [figure]