| 562 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {41} |
| 8 | DF | .~ Phosphorus acids or salts thereof (i.e., compounds having -XH, wherein X is chalcogen, attached directly to phosphorus by nonionic bonding and wherein the hydrogen may be replaced by a substituted or unsubstituted ammonium or by a group IA or IIA light metal) {7} |
| 20 |  | .~.~ Plural phosphori attached indirectly to each other by nonionic bonding {1} |
| 21 | DF | .~.~.~> Plural phosphori bonded directly to the same carbon {1} |