Sildenafil citrate,100 µg base/mL,MeOH,1mL

gamma-HCH (BHC), 10ug/ml, Solvent-acetonitrile, Unit 10mL, # of units-1, Cas.no. 58-89-9

1,3-Dibromo-2,7,8-trichloro[13C12]dibenzofuran, 1.2ml x 50ug/ml, toluene

2,4,4,5-Tetrachlorobiphenyl (BZ-74)