US PATENT SUBCLASS 534 / 770
.~.~.~.~ The hetero ring is six-membered and consists of one nitrogen and five carbons (e.g., pyridine, etc.)

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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.~.~.~.~ 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}
773  DF  .~.~.~.~.~> Plural acyclic nitrogens, other than as nitro, nitroso or azo, bonded directly to the hetero ring at the two positions adjacent to the ring nitrogen

DEFINITION

Classification: 534/770

(under subclass 753) Compounds wherein the hetero ring is six-membered and consists of one nitrogen and five carbons, e.g., pyridine, etc.

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

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