d4 C27 alpha alpha alpha (20R)-Cholestane, 100µg/mL in Isooctane, 1ml

pH 2.0 Standard @ 25°C

2,2',3,3',4,5,5'-Heptachloro-4'-methoxy[13C12]biphenyl, 1.2ml x 50ug/ml, toluene

Trifluoromethanesulfonic acid, 50µg/ml in MeOH, 5ml