EPA Method 500 Series Internal Std #4

Ditallow dimethyl ammonium chloride, hydrogenated form, 1000µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 61789-80-8

n-Octane, neat, Solvent-neat, Unit 10mL, # of units-1, Cas.no. 111-65-9

5 alpha(H),17 alpha(H),20R,21ß(H)-3ß-Acetoxycholest-8(14)-ene, , Solvent-, Unit , # of units-, Cas.no.