Complex sentence: Medrogestone itself is not a 17α-hydroxyprogesterone derivative and is instead a derivative of 17α-methylprogesterone because it features a methyl group at the C17α position instead of a hydroxy or acetoxy group.
Split into simpler sentences: Medrogestone itself is not a 17α-hydroxyprogesterone derivative and is instead a derivative of 17α-methylprogesterone. This is because it features a methyl group at the C17α position instead of a hydroxy or acetoxy group.