Inhibitors of bacterial sialidase and methods of making and using the same

A sialidase inhibitor of the shown formula I: (I) where dashed lines d1 and d2, X1, R1, R2, R6, R3, R4 and R5 are as described in the specification; or an analog, pharmaceutically acceptable salt, or derivative of the inhibitor, with the proviso that the inhibitor is not HNBA GBA or Neu5Ac2en. The inhibitor in a composition with a pharmaceutically acceptable carrier. Methods of making a pharmaceutical composition of an acceptable carrier and the inhibitor. Methods of inhibiting sialidase and methods of treating and preventing bacterial or trypanosomal infection using the inhibitor. A sialidase inhibitor of the shown formula I: (I) where dashed lines d1 and d2, X1, R1, R2, R6, R3, R4 and R5 are as described in the specification; or an analog, pharmaceutically acceptable salt, or derivative of the inhibitor, with the proviso that the inhibitor is not HNBA GBA or Neu5Ac2en. The inhibitor in a composition with a pharmaceutically acceptable carrier. Methods of making a pharmaceutical composition of an acceptable carrier and the inhibitor. Methods of inhibiting sialidase and methods of treating and preventing bacterial or trypanosomal infection using the inhibitor.