| 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} |
| 357 | DF | .~.~ Processes of forming carbon to carbon bond between carbons of two organic reactants {12} |
| 371 |  | .~.~.~ Aldehyde or ketone reactant {2} |
| 372 | DF | .~.~.~.~> Formaldehyde reactant |
| 373 | DF | .~.~.~.~> Carbonyl carbon of the aldehyde or ketone reacts to form a carbon to carbon double bond with carbon of a second reactant {1} |