| 534 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | 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 |  | .~.~.~.~.~ Acyclic oxygen bonded directly to the hetero ring {1} |
| 772 | DF | .~.~.~.~.~.~> Plural acyclic chalcogens bonded directly to the hetero ring at the two positions adjacent to the ring nitrogen |