Internal standard 2, 2000g/ml in MeOH, 1ml

Perfluorododecanesulfonic acid, 50µg/ml in MeOH, 1ml

Acetylsalicylic acid, 100 µg/ml, Acetonitrile, 1

8?H),17?,18?(H),21ß(H)-15 (14-13)-abeo-14,17-dimethyl-26,28-dinorhopane,neat,neat,ca. 5 µg,