16-Fluoroestradiol 16alpha-(18)-Fluoro-17beta-estradiol 16alpha-Fluoroestradiol 16beta-Fluoroestradiol 84693-92-5 Estra-1,3,5(10)-triene-3,17-diol, 16-fluoro-, (16beta,17beta)- F-18 16alpha-Fluoroestradiol