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} |
14 | ![]() | .~.~ Technetium containing (At. No. 43; Tc) |