Formaldehyde

Heptachlor-endo-epoxide (isomer A), 1.2mL x 100ug/mL, nonane

1,2,3,4-Tetrachlorobenzene, 1000µg/ml in MeOH, 1ml

2,3,3',5'-Tetrachlorobiphenyl ,100 µg/mL,isooctane,1mL,