osta-1,4,13-trien-3-one. Some proposals of fragment generation are indicated in the mass spectra. All spectra show dominant losses of 103 u corresponding to ●CH2-O-TMS. M/z 133 is generated from the C/D- [...] administration of 5 mg of methyltestosterone. Its 17-epimer was not detectable in the urine samples at all. Yet, the “classical metabolites” 3α5α-THMT and 3α5β-THMT could be detected up to 7 days. Additionally [...] epi-3α5β-THMT: 17β-methyl-5β- androstane-3α,17α-diol WS2010 - LECTURE 70 In case of methyl-1-testosterone all samples (collection period 4 days) were found to contain 17β-hydroxymethyl-17α-methyl-18-nor-5α-androsta-1