| 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} | 
| 95 | DF | .~.~.~.~ The compound consists of the metal, carbon and hydrogen or the metal, carbon, hydrogen and halogen (e.g., tetraalkylleads, etc.) {6} | 
| 96 |  | .~.~.~.~.~ Preparing by utilizing a magnesium containing material (e.g., Grignard reagent, etc.) |