7b). The Second sodium ion, Na2, is located opposite Na1 across the vitamin C, where strong density extending from the substrate is observed (Fig. 3a, c and Supplementary Fig. 7a). Na2 is stabilized by a cation-π interaction with the aromatic sidechain of Phe112, bey well bey by polar interactions with Ser110 and https://notes.io/wRxws