Disclosed herein are compounds that stabilize recombinant human α-iduronidase (rh-α-IDUA) activity, and their uses in the treatment and / or prophylaxis of lysosomal storage diseases (LSDs), such as
mucopolysaccharidosis type I (MPS1). The compound disclosed herein has the structure of formula (I),wherein, n is an integral between 0 and 2; X1 is O or —NH; X2 is O, —NH or —NRa, inwhich Ra is C1-10
alkyl; Y is H orwherein m and p are independently 0 or 1; X3 is S, O, or —NH; X4 is O, —NH,
methylene, or —CH2(C1-10)
alkyl; and A is
aryl, heteroaryl, or heterocyclyl optionally substituted with one or more
substituent selected from the group consisting of halo, hydroxyl, amino and
phosphate.