What a great question crazy legs!
I'm sorry, but I can guarantee that not a single person will know its boiling point. Why? Well it's because Oestrogen is a generic term used to describe any hormone with oestrogenic activity produced by the ovaries, adrenal cortices and to a lesser extent, by the testes..
Under normal circumstances, the most common Oestrogens are Oestrone, Oestradiol and Oestriol. These occur naturally in the body with Oestradiol being the most potent. Each of these three hormones possesses different physical and chemical properties which include such things as their boiling point.
There are also oestrogens which are used for therapeutic purposes. These include Mestranol, Diethylstilbaestrol and Ethinylestradiol.
Oestrogens are used in the contraceptive pill and as part of HRT therapy.