(3aR,​4R,​5R,​6aS)​-Hexahydro-​5-​hydroxy-​4-​[(1E,​3R)​-​3-​hydroxy-​4-​[3-​(trifluoromethyl)​phenoxy]​-​1-​buten-​1-​yl]​-​2H-​cyclopenta[b]​furan-​2-​one