| 558 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {21} |
| 303 | DF | .~ Nitriles (i.e., compounds having cyano bonded directly to carbon, which carbon may be single bonded to any atom but may be multiple bonded only to carbon) {21} |
| 411 | DF | .~.~ Benzene ring bonded directly to the cyano group {6} |
| 423 |  | .~.~.~ Oxygen attached indirectly to the cyano group by nonionic bonding {1} |
| 424 | DF | .~.~.~.~> Two benzene rings bonded directly to the same oxygen, or nitrogen bonded directly to oxygen (e.g., nitro compounds, phenoxyphenyl compounds, etc.) |