| 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} |
| 64 |  | .~.~ Arsenic, antimony, or bismuth containing (As, Sb, or Bi) {5} |
| 65 | DF | .~.~.~> Arsenic double bonded directly to arsenic (e.g., arsenobenzenes, etc.) {1} |
| 68 | DF | .~.~.~> Tricyclo ring system having a six-membered ring, which includes heavy metal and nitrogen or chalcogen, as one of the cyclos (e.g., phenoxarsines, phenarsazines, etc.) |
| 69 | DF | .~.~.~> Sulfur double bonded directly to chalcogen |
| 70 | DF | .~.~.~> Carbon bonded directly to the metal {1} |
| 76 | DF | .~.~.~> Chalcogen bonded directly to the metal {2} |