| 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} |
| 414 | DF | .~.~.~ Carbonyl attached indirectly to the cyano group by nonionic bonding {2} |
| 415 |  | .~.~.~.~ Benzene ring bonded directly to the carbonyl {1} |
| 416 | DF | .~.~.~.~.~> Oxygen bonded directly to the carbonyl (e.g., benzoic acid esters, etc.) |