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} |
335 | DF | .~.~ Protecting or removing protective groups, e.g., carboxyl group protection, etc. {2} |
337 | .~.~.~ Of amino group |