Abstract: A compound of formula V or formula VI for use in the treatment of a demyelinating peripheral neuropathy: wherein X is O, S, SO or SO2, R1 is halogen, trihalomethyl, OH, C1-7alkyl, C1-4alkoxy, trifluoromethoxy, phenoxy, cyclohexylmethyloxy, pyridylmethoxy, cinnamyloxy, naphthylmethoxy, phenoxymethyl, CH2—OH, CH2—CH2—OH, C1-4alkylthio, C1-4alkylsulfinyl, C1-4alkylsulfonyl, benzylthio, acetyl, nitro or cyano, or phenyl, phenylC1-4alkyl or phenyl-C1-4alkoxy each phenyl group thereof being optionally substituted by halogen, CF3, C1-4alkyl or C1-4alkoxy; R2 is H, halogen, trihalomethyl, C1-4alkoxy, C1-7alkyl, phenethyl or benzyloxy; R3 is H, halogen, CF3, OH, C1-7alkyl, C1-4alkoxy, benzyloxy, phenyl or CMalkoxymethyl; each of R4 and R5, independently is H or a residue of formula (a), wherein each of R8 and R9, independently, is H or C1-4alkyl optionally substituted by halogen; and n is an integer from 1 to 4; and the N-oxide derivatives thereof or prodrugs thereof, or a pharmaceutically acceptable salt, solvate or

Abstract: A compound of formula A1 or A2 for use in the treatment of a demyelinating peripheral neuropathy: wherein A is COOR5, OPO(OR5)2, PO(OR5)2, SO2OR5, POR5OR5 or 1H-tetrazol-5-yl, R5 being H or an ester-forming group, optionally C1-6alkyl; W is a bond, C1-3alkylene or C2-3alkenylene; Y is C6-10aryl or C2-9heteroaryl eg C3-9heteroaryl, optionally substituted by 1 to 3 radicals selected from halogen, OH, NO2, C1-6alkyl, C1-6alkoxy; halo-substituted C1-6alkyl and halo-substituted C1-6alkoxy; Z is chosen from: wherein the asterisks of Z indicate the point of attachment between —C(R3)(R4)— and A of Formula Ia or Ib, respectively; R6 is chosen from hydrogen and C1-6alkyl; and J1 and J2 are independently methylene or a heteroatom chosen from S, O and NR5; wherein R5 is chosen from hydrogen and C1-6alkyl; and any alkylene of Z can be further substituted by one to three radicals chosen from halo, hydroxy, C1-6alkyl; or R6 can be attached to a carbon atom of Y to form a 5-7 member ring; R1 is C6-10aryl or C