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1H-NMR analysis of the dephosphorylated Peak A compound 22. The DXP sample used was labeled with 13C on the methyl group (unrelated reasons) hence the additional splitting of the H2/H3/H4 protons. Additional proton coupling, from the 2D dqf-COSY experiment, are indicated on the structure. (Supplementary Figure 4, 5 and 6).
