528 / | HD | SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES |
* | DD | SYNTHETIC RESINS (Class 520, Subclass 1) {23} |
373 | DF | .~ FROM SULFUR-CONTAINING REACTANT {5} |
374 | DF | .~.~ From mercaptan or mercaptide-containing reactant {2} |
376 | ![]() | .~.~.~ With ethylenically unsaturated reactant |