| 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} |
| 118 | DF | .~.~ Zinc, cadmium, or mercury containing (Zn, Cd, or Hg) {3} |
| 121 |  | .~.~.~ Carbon bonded directly to the metal {3} |
| 122 | DF | .~.~.~.~> Chalcogen bonded directly to the metal {2} |
| 128 | DF | .~.~.~.~> Cyano, nitrogen or halogen bonded directly to the metal |
| 129 | DF | .~.~.~.~> The compound consists of the metal, carbon and hydrogen (e.g., dialkyl zinc, etc.) |