US PATENT SUBCLASS 548 / 125
.~.~.~ The five-membered hetero ring consists of chalcogen, plural nitrogens, and carbon

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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}
125.~.~.~ The five-membered hetero ring consists of chalcogen, plural nitrogens, and carbon {7}
126  DF  .~.~.~.~> Polycyclo ring system having the five-membered hetero ring as one of the cyclos
127  DF  .~.~.~.~> 1,2,3-thiadiazoles (including hydrogenated)
128  DF  .~.~.~.~> 1,2,4-thiadiazoles (including hydrogenated) {1}
131  DF  .~.~.~.~> 1,2,4-oxadiazoles (including hydrogenated) {2}
134  DF  .~.~.~.~> 1,2,5-thiadiazoles (including hydrogenated) {1}
136  DF  .~.~.~.~> 1,3,4-thiadiazoles (including hydrogenated) {3}
143  DF  .~.~.~.~> 1,3,4-oxadiazoles (including hydrogenated) {2}

DEFINITION

Classification: 548/125

(under subclass 100) Compounds wherein the five-membered hetero ring includes at least one atom each of chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) and carbon and at least two ring nitrogens, and contains no other elements as ring members.

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