Each vial contains approximately 400 nanograms of each compound in crystalline form.1,3,6,8-TetraCDF 1,2,3,4,6,8-HexaCDF1,2,8,9-TetraCDF 1,2,3,4,8,9-HexaCDF1,3,4,6,8-PentaCDF 1,2,3,4,6,7,8-HeptaCDF1,2,3,8,9-PentaCDF 1,2,3,4,7,8,9-HeptaCDFStorage instructi