| 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} |
| 225 | DF | .~.~ Amidines (i.e., HN=CH-HNH, wherein substition may be made for hydrogen only) {5} |
| 226 | DF | .~.~.~ Amidino hydrazines or hydrazones (i.e., HNH-N=CH-HNH or HN=CH-NH-HNH, wherein substitution may be made for hydrogen only) {1} |
| 227 | DF | .~.~.~.~ Guanyl hydrazines or hydrozones (i.e., HNH-N=C(-HNH)-HNH or HN=C(-HNH)-NH HNH, wherein substitution may be made for hydrogen only) {1} |
| 228 |  | .~.~.~.~.~ Benzene ring containing |