| 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} |
| 860 | DF | .~.~.~.~ Acyclic -C(=X)- containing, wherein X is chalcogen (e.g., carbonyl, etc.) {1} |
| 861 | DF | .~.~.~.~.~ Hydroxy bonded directly to a bicyclo ring system (H of hydroxy may be replaced by a substituted or unsubstituted ammonium ion or a Group IA or IIA light metal) {2} |
| 862 | DF | .~.~.~.~.~.~ Nitrogen bonded directly to the -C(=X)- group (e.g., carboxamide, etc.) {2} |
| 872 | DF | .~.~.~.~.~.~.~ The nitrogen is additionally bonded directly to the bicyclo ring system {1} |
| 873 |  | .~.~.~.~.~.~.~.~ Additional acyclic -C(=X)- group |