Estriolsynonyms: tridestrin; (16-alpha, 17-beta)-estra-1, 3, 5(10)-triene-3, 16, 17-triolcas: 50-27-1mf: c18h24o3mw: 288.38packing: foil bagappearance: white crystalline powderstandards: usp27usage: a metabolite of estradiol. An estrogenic metabolite considerably less potent than the hormone estradiol