| 528 / | HD | SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES |
| * | DD | SYNTHETIC RESINS (Class 520, Subclass 1) {23} |
| 271 | DF | .~ FROM CARBOXYLIC ACID OR DERIVATIVE THEREOF {10} |
| 332 | DF | .~.~ With organic amine, or from organic amine salt of a carboxylic acid {2} |
| 335 | DF | .~.~.~ From dicarboxylic acid or derivative thereof and an organic amine, or from an organic amine salt of a dicarboxylic acid {13} |
| 347 | DF | .~.~.~.~ Aryl ring-containing reactant {1} |
| 348 | | .~.~.~.~.~ All reactants contain at least one aryl ring |