| 556 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {3} |
| 1 | DF | .~ HEAVY METAL CONTAINING (e.g., Ga, In or T1, etc.) {19} |
| 13 | DF | .~.~ Phosphorus containing {6} |
| 15 | DF | .~.~.~ The heavy metal is bonded directly to the carbon of a -C(=X)- group, wherein X is chalcogen (e.g., cyclopentadienyl manganese dicarbonyl triphenyl phosphine, etc.) {1} |
| 16 | | .~.~.~.~ Iron, cobalt, nickel, ruthenium, rhodium, palladium, osmium, iridium, or platinum containing (Fe, Co, Ni, Ru, Rh, Pd, Os, Ir or Pt) |