| 556 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {3} |
| 400 | DF | .~ SILICON CONTAINING {19} |
| 413 |  | .~.~ Nitrogen attached indirectly to silicon by nonionic bonding {7} |
| 414 | DF | .~.~.~> The nitrogen is in an isocyanato or isothiocyanato group (i.e., -NCO or -NCS) |
| 415 | DF | .~.~.~> The nitrogen is in a cyano group (i.e., -CN) {2} |
| 418 | DF | .~.~.~> Having -C(=X)-, wherein X is chalcogen, attached indirectly to silicon by nonionic bonding {1} |
| 422 | DF | .~.~.~> Chalcogen attached directly to the nitrogen by nonionic bonding |
| 423 | DF | .~.~.~> Plural carbons bonded directly to the same chalcogen |
| 424 | DF | .~.~.~> Plural nitrogens bonded directly to the same carbon or attached by a chain consisting of carbons, which carbons may be part of a ring |
| 425 | DF | .~.~.~> Two silicons bonded directly to the same oxygen |