| 534 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES | 
| * | DD | ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1) {8} | 
| 10 | DF | .~ RADIOACTIVE METAL CONTAINING (At. No. 43, 61 or 84+; or radioactive isotope of another metal) {2} | 
| 11 | DF | .~.~ Actinide series metal (At. No. 89+) {1} | 
| 12 | DF | .~.~.~ Containing -C(=X)-, wherein X is chalcogen (e.g., carbonyl containing, etc.) {1} | 
| 13 |  | .~.~.~.~ The -C(=X)- is part of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens |