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. 2019 May 5;11(5):417. doi: 10.3390/v11050417

Figure 1.

Figure 1

(A). Structures of Neu5Ac2en (1), BCX 2798 (2), and the difluoro analogue of BCX 2798 (3); (B). Proposed catalytic mechanism for all of the studied sialidases confirmed by the X-ray crystal structures of the trapped neuraminosyl–enzyme intermediate.