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Separation of 14 diastereomers by RP preparative HPLC. Left: 31P NMR spectrum of 14a/b as synthesized displays two pairs of doublets for both Pα and Pβ. Right: 31P NMR (14a and 14b) spectra of separated diastereomers show single pairs of doublets for Pα and Pβ.
