| 558 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
| * | 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} |
| 365 | | .~.~.~ Formation of a carbocyclic ring {1} |
| 366 | DF | .~.~.~.~> Three- or four-membered monocyclic ring formed |