US PATENT SUBCLASS 544 / 394
.~.~.~.~.~.~.~ The other ring nitrogen has a substituent which includes chalcogen single bonded to acyclic carbon

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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}
392  DF  .~.~.~.~.~.~ Phenyl or naphthyl bonded directly to ring nitrogen of the piperazine ring {3}
394.~.~.~.~.~.~.~ The other ring nitrogen has a substituent which includes chalcogen single bonded to acyclic carbon

DEFINITION

Classification: 544/394

The other ring nitrogen has a substituent which includes chalcogen single bonded to acyclic carbon:

(under subclass 392) Compounds wherein the other ring nitrogen of the piperazine ring has a substituent which includes chalcogen (i.e., oxygen, sulfur, selenium or tellurium) singly bonded to an acyclic carbon, e.g., an alcohol or ether, etc.

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