US PATENT SUBCLASS 544 / 368
.~.~.~.~.~.~.~.~.~ The five-membered hetero ring is one of the cyclos in a polycyclo ring system

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544 /   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) {1}
1  DF  .~.~ Hetero ring is six-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) {6}
224  DF  .~.~.~ The six-membered hetero ring consists of two nitrogens and four carbons (e.g., 1,2-diazines, etc.) {9}
336  DF  .~.~.~.~ 1,4-diazines {9}
358  DF  .~.~.~.~.~ Piperazines (i.e., fully hydrogenated 1,4-diazines) {12}
359  DF  .~.~.~.~.~.~ Additional hetero ring containing {4}
366  DF  .~.~.~.~.~.~.~ Five-membered hetero ring having two or more ring hetero atoms of which at least one is nitrogen {3}
367  DF  .~.~.~.~.~.~.~.~ Ring chalcogen in the five-membered hetero ring {2}
368.~.~.~.~.~.~.~.~.~ The five-membered hetero ring is one of the cyclos in a polycyclo ring system

DEFINITION

Classification: 544/368

The five-membered hetero ring is one of the cyclos in a polycyclo ring system:

(under subclass 367) Compounds wherein the five-membered hetero ring is one of the cyclos of a polycyclo ring system.