| 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} |
| 138 | DF | .~.~ Iron, cobalt, or nickel containing (Fe, Co, or Ni) {3} |
| 140 |  | .~.~.~ Carbon bonded directly to the metal {2} |
| 141 | DF | .~.~.~.~> Chalcogen double bonded directly to the carbon (e.g., butadiene iron tricarbonyls, etc.) {1} |
| 143 | DF | .~.~.~.~> Plural unsaturated five-membered carbocyclic rings bonded directly to the metal (e.g., ferrorcenes, bis indenyl iron, etc.) {1} |