ur on id ated : ▁ ▁E str one ▁ 3 - gl uc ur on ide ▁( E 1 - G ) ▁ ▁E str adi ol ▁ 3 - gl uc ur on ide ▁( E 2 - 3 G ) ▁and ▁est rad i ol ▁ 1 7 β - gl uc ur on ide ▁( E 2 - 1 7 G ) ▁ ▁Est ri ol ▁ 3 - gl uc ur on ide ▁( E 3 - 3 G ), ▁est ri ol ▁ 1 6 α - gl uc ur on ide ▁( E 3 - 1 6 G ) ▁ ▁M ixed : ▁ ▁Est ri ol ▁ 3 - s ulf ate ▁ 1 6 α - gl uc ur on ide ▁( E 3 - 3 S - 1 6 G ) ▁ ▁Est ro gen ▁conjug ates ▁are ▁conjug ated ▁at ▁the ▁C 3 , ▁C 1 6 α , ▁and / or ▁C 1 7 β ▁positions , ▁where ▁hydro x yl ▁groups ▁are ▁available . ▁ ▁Est ro gen ▁conjug ates ▁have ▁been ▁used ▁as ▁ph arma ce ut ical ▁est rog ens , ▁as ▁in ▁est r one ▁sul f ate ▁as ▁est rop ip ate ▁( pi per azine ▁est r one ▁sul f ate ) ▁and ▁in ▁conjug ated ▁est rog ens ▁( P rem arin ) ▁and ▁conjug ated ▁est ri ol ▁( Pro g yn on , ▁Em men in ). ▁ ▁See ▁also ▁ ▁C