17-Fluorescein estrone 76841-57-1 Estra-1,3,5(10)-trien-17-one, 3-hydroxy-, (((3',6'-dihydroxy-3-oxospiro(isobenzofuran-1(3H),9'-(9H)xanthen)-5-yl)amino)thioxomethyl)hydrazone Estrone-17-fluorescein