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Estrogen

Frae Wikipedia, the free beuk o knawledge
Estradiol. Note ane hydroxyl group attached tae the D raing. The 'di' refers baith tae this hydroxyl an the ane on the A raing (leftmost).

Estrogen or oestrogen is the primary female sex hormone an is responsible for development an regulation o the female reproductive seestem an seicontar sex characteristics.