| 556 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {3} |
| 1 | DF | .~ HEAVY METAL CONTAINING (e.g., Ga, In or T1, etc.) {19} |
| 81 | DF | .~.~ Germanium, tin, or lead containing (Ge, Sn, or Pb) {6} |
| 87 | DF | .~.~.~ Carbon bonded directly to the metal {2} |
| 88 | DF | .~.~.~.~ Chalcogen bonded directly to the metal {2} |
| 89 |  | .~.~.~.~.~ Plural chalcogens bonded directly to the metal {2} |
| 90 | DF | .~.~.~.~.~.~> At least one of the chalcogens is part of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens {2} |
| 93 | DF | .~.~.~.~.~.~> Having -C(=X)X-, are the same or diverse chalcogens, attached indirectly to the metal by nonionic bonding (e.g., dialkyl tin thioglycollic acid esters, etc.) |