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Structure of POM-biot2 [γ-SiW10O36{(C5H7N2OS)(CH2)4CONH(CH2)3Si}2O]4− showing the organic domain, including the biotin and an aminopropyl spacer, and the ball & stick model of the inorganic scaffold (blue balls = W atoms; red balls = oxygen atoms), and possible POM binding modes (bridging or tweezer) with the avidin homotetramer.
