(b) Endogenous** AAS when administered exogenously:   Androstenediol (androst-5-ene-3 β,17β-diol) , androstenedione (androst-4-ene-3,17-dione) , dihydrotestosterone (17β-hydroxy-5 α-androstan-3-one) , prasterone (dehydroepiandrosterone, DHEA) , testosterone,  and the following metabolites and isomers:   5α-androstane-3 α,17α-diol, 5 α-androstane-3 α,17β-diol, 5 α-androstane-3β,17α-diol, 5α-androstane-3 β,17β-diol; androst-4-ene-3 α,17α-diol, androst-4-ene-3α,17β-diol, androst-4-ene-3β ,17α-diol, androst-5-ene-3α ,17α-diol; androst-5-ene-3 α,17β-diol, androst-5-ene-3 β,17α-diol, 4-androstenediol (androst-4-ene-3 β,17β-diol) , 5-androstenedione (androst-5-ene-3,17-dione), epi-dihydrotestosterone, epitestosterone, 3 α-hydroxy-5 α-androstan-17-one, 3β-hydroxy-5α -androstan-17-one, 19-norandrosterone, 19-noretiocholanolone .