564 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
* | 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} |
47 | DF | .~.~.~ Benzene ring containing {2} |
56 | .~.~.~.~ Aralkyl bonded directly to urea nitrogen |