| 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} |
| 838 | DF | .~.~ Exactly one azo group containing or azo attached indirectly to an additional azo group by ionic bonding {3} |
| 839 | DF | .~.~.~ Plural benzene rings bonded directly to the azo group {5} |
| 843 | DF | .~.~.~.~ Each of the benzene rings is monocyclic {3} |
| 850 |  | .~.~.~.~.~ Containing -C(=X)-, wherein X is chalcogen {3} |
| 851 | DF | .~.~.~.~.~.~> The -C(=X)- is bonded directly to one of the benezene rings |
| 852 | DF | .~.~.~.~.~.~> The -C(=X)- is in a -C(=X)X- group, wherein the X's may be the same or diverse chalcogens {2} |
| 855 | DF | .~.~.~.~.~.~> Chalcogen, having no direct bond to a ring, attached directly by a single bond to acyclic carbon |