US PATENT SUBCLASS 534 / 772
.~.~.~.~.~.~ Plural acyclic chalcogens bonded directly to the hetero ring at the two positions adjacent to the ring nitrogen


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534 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1) {8}
573  DF  .~ Azo {51}
751  DF  .~.~ Hetero ring containing {5}
753  DF  .~.~.~ Azo bonded directly to the hetero ring or to a polycyclo ring system which contains the hetero ring as one of the cyclos {11}
770  DF  .~.~.~.~ The hetero ring is six-membered and consists of one nitrogen and five carbons (e.g., pyridine, etc.) {2}
771  DF  .~.~.~.~.~ Acyclic oxygen bonded directly to the hetero ring {1}
772.~.~.~.~.~.~ Plural acyclic chalcogens bonded directly to the hetero ring at the two positions adjacent to the ring nitrogen


DEFINITION

Classification: 534/772

(under subclass 771) Compounds wherein at least two acyclic chalcogens, (i.e., oxygen, sulfur, selenium or tellurium) are bonded directly to the hetero ring at the two positions which are adjacent to the ring in nitrogen.

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