Tetraethyltin, 1000 µg/ml, Methanol, 5ml

17?,18?(H),21ß(H),17-methyl-28-norhopane,neat,neat,ca. 5 µg,

2,2',5,5'-Tetrachlorobiphenyl,neat,neat,10mg,

4-Nitroaniline,100 µg/mL,acetonitrile,1mL,