| 530 / | HD | CHEMISTRY: NATURAL RESINS OR DERIVATIVES; PEPTIDES OR PROTEINS; LIGNINS OR REACTION PRODUCTS THEREOF |
| 350 | DF | PROTEINS, I.E., MORE THAN 100 AMINO ACID RESIDUES {14} |
| 402 | DF | .~ Chemical modification or the reaction product thereof, e.g., covalent attachment or coupling, etc. {5} |
| 408 | | .~.~ Sulfur containing reactant |