A compound comprising a carbohydrate moiety and a linker Z, wherein said carbohydrate moiety mimics a glycoepitope comprised by a glycosphingolipid of the nervous system, wherein said compound is a compound of formula or formula, wherein formula is wherein R I1 is Z or or wherein R I2 is H, SO 3 H, or or or or wherein R I3 is H or wherein R I4 is H or wherein R I5 and R I6 are independently H or wherein R I7 is H or and wherein formula is wherein R II1 is Z or wherein R II2 is Z or or wherein Z is -N(R a)-A-B-CH 2 -(CH 2) q -SH, wherein R a is H, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, CH 2 C 6 H 5, CH 2 CH 2 C 6 H 5, OCH 2 C 6 H 5, or OCH 2 CH 2 C 6 H 5; A is C 1 -C 7 -alkylene, C 1 -C 7 -alkoxy, C 1 -C 4 -alkyl-(OCH 2 CH 2) p O-C 1 -C 4 -alkyl, or C 1 -C 7 -alkoxy-R b, wherein R b is an optionally substituted aryl or an optionally substituted heteroaryl, and wherein p is 0 to 6, preferably p is 1, 2 or 3, and further preferably p is 1; B is NHC, S or CH 2; q is 0 to 6, preferably q is 1, 2, 3 or 4, and further preferably q is 1 or 2; and wherein said linker Z is covalently bound via its -N(R a)-group to the reducing end of said carbohydrate moiety. wherein R I1 is Z or or wherein R I2 is H, SO 3 H, or or or or wherein R I3 is H or wherein R I4 is H or wherein R I5 and R I6 are independently H or wherein R I7 is H or and wherein formula is wherein R II1 is Z or wherein R II2 is Z or or wherein Z is -N(R a)-A-B-CH 2 -(CH 2) q -SH, wherein R a is H, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, CH 2 C 6 H 5, CH 2 CH 2 C 6 H 5, OCH 2 C 6 H 5, or OCH 2 CH 2 C 6 H 5; A is C 1 -C 7 -alkylene, C 1 -C 7 -alkoxy, C 1 -C 4 -alkyl-(OCH 2 CH 2) p O-C 1 -C 4 -alkyl, or C 1 -C 7 -alkoxy-R b, wherein R b is an optionally substituted aryl or an optionally substituted heteroaryl, and wherein p is 0 to 6, preferably p is 1, 2 or 3, and further preferably p is 1; B is NHC, S or CH 2; q is 0 to 6, preferably q is 1, 2, 3 or 4, and further preferably q is 1 or 2; and wherein said linker Z is covalently bound via its -N(R a)-group to the reducing end of said carbohydrate moiety. wherein R II1 is Z or wherein R II2 is Z or or wherein Z is -N(R a)-A-B-CH 2 -(CH 2) q -SH, wherein R a is H, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, CH 2 C 6 H 5, CH 2 CH 2 C 6 H 5, OCH 2 C 6 H 5, or OCH 2 CH 2 C 6 H 5; A is C 1 -C 7 -alkylene, C 1 -C 7 -alkoxy, C 1 -C 4 -alkyl-(OCH 2 CH 2) p O-C 1 -C 4 -alkyl, or C 1 -C 7 -alkoxy-R b, wherein R b is an optionally substituted aryl or an optionally substituted heteroaryl, and wherein p is 0 to 6, preferably p is 1, 2 or 3, and further preferably p is 1; B is NHC, S or CH 2; q is 0 to 6, preferably q is 1, 2, 3 or 4, and further preferably q is 1 or 2; and wherein said linker Z is covalently bound via its -N(R a)-group to the reducing end of said carbohydrate moiety. R a is H, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, CH 2 C 6 H 5, CH 2 CH 2 C 6 H 5, OCH 2 C 6 H 5, or OCH 2 CH 2 C 6 H 5; A is C 1 -C 7 -alkylene, C 1 -C 7 -alkoxy, C 1 -C 4 -alkyl-(OCH 2 CH 2) p O-C 1 -C 4 -alkyl, or C 1 -C 7 -alkoxy-R b, wherein R b is an optionally substituted aryl or an optionally substituted heteroaryl, and wherein p is 0 to 6, preferably p is 1, 2 or 3, and further preferably p is 1; B is NHC, S or CH 2; q is 0 to 6, preferably q is 1, 2, 3 or 4, and further preferably q is 1 or 2; and