<unk>  is a pregnane (C21) steroid that is obtained by hydroxylation of pregnenolone at the C17α position. This step is performed by the mitochondrial cytochrome P450 enzyme 17α-hydroxylase (CYP17A1) that is present in the adrenal and gonads. Peak levels are reached in humans at the end of puberty and then decline. High levels are also achieved during pregnancy. It is also a known neuromodulator.
17α-Hydroxypregnenolone
11-Ketoprogesterone
5α-Dihydronormethandrone
3β-Methoxypregnenolone
8,9-Dehydroestrone
5α-Dihydroethisterone
17α-Methylprogesterone
Methyl-1-testosterone