… natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or …
Explanatory notes
… natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or … heading 39.16 , 39.17 , 39.20 or 39.21 ). (3) Chemical derivatives of natural rubber Natural rubber, which … ( heading 35.05 ). (f) Rosin, resin acids and their derivatives (including ester gums and run gums) ( heading …