| 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} |
| 435 | DF | .~.~ Acyclic (e.g., purification of saturated nitriles, etc.) {9} |
| 436 | DF | .~.~.~ Sulfur attached indirectly to the cyano group by nonionic bonding {2} |
| 438 | DF | .~.~.~.~ Two carbons bonded directly to the same divalent sulfur {1} |
| 439 |  | .~.~.~.~.~ Additional cyano group |