0977.27 C27 aaa (20R)-Cholestane [122241-86-5] 50 µg/mL 0978.10 Naphthalene-d8 [1146-65-2] 100 µg/mL 0389.14 Phenanthrene-d10 [1517-22-2] 100 µg/mL 0383.12 Dibenzothiophene-d8 [33262-29-2] 100 µg/mL