| 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} |
| 418 | DF | .~.~.~ Nitrogen, except as nitro or nitroso, attached indirectly to the cyano group by nonionic bonding {2} |
| 422 |  | .~.~.~.~ The nitrogen is attached indirectly to a benzene ring by acyclic nonionic bonding |