81352-82-1 Biotin-estrone conjugate Biotinylestrone Biotinyloestrone Estra-1,3,5(10)-trien-17-one, 3-((5-(hexahydro-2-oxo-1H-thieno(3,4-d)imidazol-4-yl)-1-oxopentyl)oxy)-, (3(3aS,4S,6aR))-