| 564 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {1} |
| 1 | DF | .~ AMINO NITROGEN CONTAINING (E.G., UREA, SULFONAMIDES, NITROSAMINES, OXYAMINES, ETC., AND SALTS THEREOF) {37} |
| 305 | DF | .~.~ Benzene ring containing {24} |
| 315 | DF | .~.~.~ Two aryl rings or ring systems bonded directly to the same carbon {7} |
| 323 | DF | .~.~.~.~ Amino nitrogen attached to aryl ring or ring system by an acyclic carbon or chain {2} |
| 324 | DF | .~.~.~.~.~ Oxygen or sulfur is bonded directly to the aryl ring or ring system and is part of the chain {1} |
| 325 |  | .~.~.~.~.~.~ Additional similar chain |