Stored Standard Observed Peaks
Standard Peaks Contaminant Peaks
Derivatized Underivatized Derivatized Underivatized Unknown
Cholesterol Cholesterol tms ether Cholesterol      
β-epoxide β-epoxide tms ether β-epoxide β-epoxide triol tms ether   β-epoxide triol Related
3,5-7-one   3,5-7-one      
5αC   5αC      
Table 1: Peaks observed from the original standards after storage and derivatization.