| 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} |
| 787 |  | .~.~.~.~ The hetero ring is one of the cyclos in a polycyclo ring system {3} |
| 788 | DF | .~.~.~.~.~> The hetero ring consists of sulfur, nitrogen and carbon (e.g., benzothiazole, etc.) |
| 789 | DF | .~.~.~.~.~> Chalcogen double bonded directly to the hetero ring |
| 790 | DF | .~.~.~.~.~> The hetero ring is five-membered and consists of one nitrogen and four carbons (e.g., indole, etc.) |