| 564 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {1} |
| 1 | DF | .~ AMINO NITROGEN CONTAINING (E.G., UREA, SULFONAMIDES, NITROSAMINES, OXYAMINES, ETC., AND SALTS THEREOF) {37} |
| 32 | DF | .~.~ Ureas (i.e., HNH-CO-HNH, wherein substitution may be made for hydrogen only) {9} |
| 63 |  | .~.~.~ Urea per se or salt thereof {5} |
| 64 | DF | .~.~.~.~> Preparing directly from cyano containing compound |
| 65 | DF | .~.~.~.~> Preparing directly from ammonia and carbonmonoxide or carbon oxysulfide (e.g., from ammonia and COS, etc.) |
| 66 | DF | .~.~.~.~> Preparing directly from ammonium carbamate (i.e., from HNH-COO-HHNHH) |
| 67 | DF | .~.~.~.~> Preparing directly from ammonia and carbon dioxide {3} |
| 73 | DF | .~.~.~.~> Purification or recovery |