Special Provision: T20

Ethyl chlorothioformate

Ethyl chloroformate

Dimethylhydrazine, symmetrical

Dimethylhydrazine, unsymmetrical

Dimethyl sulfate

Diketene, stabilized

3,5-Dichloro-2,4,6-trifluoropyridine

Cyclohexyl isocyanate

Crotonaldehyde or Crotonaldehyde, stabilized

Chlorosulfonic acid (with or without sulfur trioxide)