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Optimization of a novel binding motif to to (e)-3-(3,5-difluoro-4-((1r,3r)-2-(2-fluoro-2-methylpropyl)-3-methyl-2,3,4,9-tetrahydro-1h- pyrido(3,4-b)indol-1-yl)phenyl)acrylic acid (azd9496), a potent and orally bioavailable selective estrogen receptor downregulator and antagonist