| 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} |
| 462 | DF | .~.~.~ Carbon to carbon unsaturation containing {1} |
| 463 |  | .~.~.~.~ Purification or recovery {3} |
| 464 | DF | .~.~.~.~.~> Utilizing ion exchange resin, or a silicon, aluminum, or heavy metal containing material |
| 465 | DF | .~.~.~.~.~> Of nitriles prepared by hydrocyanation (e.g., by reaction of acetylene with hydrogen cyanide, etc.) |
| 466 | DF | .~.~.~.~.~> Of nitriles prepared by reaction of an organic compound, ammonia, and molecular oxygen or a molecular oxygen-containing gas (i.e., of nitriles prepared by ammoxidation) |