... Pressur 4.08E-12mmHg at 25°C 2. Descriptions: Estradiol benzoate (INN; brand names Agofollin, Diffolisterol, Progynon-B, ... specifically the 3-benzoyl ester, of the natural estrogen, estradiol. It was the first form of estrogen to be ... mostly superseded by newer forms of estradiol with improved pharmacokinetics that require less frequent administration such as estradiol cypionate and estradiol valerate.