| 530 / | HD | CHEMISTRY: NATURAL RESINS OR DERIVATIVES; PEPTIDES OR PROTEINS; LIGNINS OR REACTION PRODUCTS THEREOF | 
| 300 | DF | PEPTIDES OF 3 TO 100 AMINO ACID RESIDUES {29} | 
| 333 | DF | .~ Synthesis of peptides {4} | 
| 338 | DF | .~.~ Solution phase synthesis {4} | 
| 339 |  | .~.~.~ Segment condensation, e.g., Ugi condensation, etc. |