| 534 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
| * | DD | ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1) {8} |
| 573 | DF | .~ Azo {51} |
| 816 | DF | .~.~ Exactly two azo groups attached indirectly to each other by nonionic bonding {7} |
| 831 | | .~.~.~ Plural benzene rings bonded directly to each azo group {1} |
| 832 | DF | .~.~.~.~> At least one of the benzene rings is part of a bicyclo ring system {2} |