Abstract: The peptides of formula (I) where: R1 is the group attached to the N-terminal of the first amino acid of the sequence P, optionally via the ligand X, and is selected from H, CH3C(?O)—, and maleimide; X is a biradical selected from —NH—(CH2)r—C(?O)—, —C(?O)—(CH2)r—C(?O)—, —S(CH2)r—, —S—(CH2)r—C(?O)—, —O—(CH2)r—, —S—CH—CH(NH2)—C(?O)—, —O—(CH2)r—C(?O)—, —(CH2)r—C(?O)—, —NH—O—CH2—C(?O)—NH—(CH2)r—CH(NH2)—C(?O)—, —(CH2)r—C(?O)—NH—(CH2)r—CH(NH2)—C(?O)—, and —NH—(CH2)r—CH(NHC(?O)CH2NH2)—C(?O)—; r is 1-5; P is a biradical of an amino acid sequence comprising the sequence D-Pro-D-Trp-D-Val-D-Pro-D-Ser-D-Trp-D-Met-D-Pro-D-Pro-D-Arg-D-His-D-Thr (SEQ ID NO: 1); Y is the group attached to the C-terminal of the last amino acid of the sequence P, and is selected from —NH2, —OH, —OR2 and —NHR2; R2 is a radical selected from (C1-C6)-alkyl and (CH2)2—NH—C(?O)—CH2—O—NH2; k is 0-2; m is 0-1; with the proviso that when the biradical X is —C(?O)(CH2)r—C(?O)—, then R1 is H; when the N of the amino acid of the sequence P to which is

Abstract: The peptides of formula (I) R1—(X)K—P—Y, where: R1 is the group attached to the N-terminal of the first amino acid of the sequence P, optionally via the ligand X, and is selected from H, CH3C(?O)—, and maleimide; X is a biradical selected from —NH—(CH2)r—C(?O)—, —C(?O)—(CH2)r—C(?O)—, —S(CH2)r—, —S—(CH2)r—C(?O)—, —O—(CH2)r—, —S—CH2—CH(NH2)—C(?O)—, —O—(CH2)r—C(?O)—, —(CH2)r—C(?O)—, —NH—O—CH2—C(?O)—NH—(CH2)r—CH(NH2)—C(?O)—, —(CH2)r—C(?O)—NH—(CH2)r—CH(NH2)—C(?O)—, and —NH—(CH2)r—CH(NHC(?O)CH2NH2)—C(?O)—; r is 1-5; P is a biradical of an amino acid sequence comprising the sequence D-Pro-D-Trp-D-Val-D-Pro-D-Ser-D-Trp-D-Met-D-Pro-D-Pro-D-Arg-D-His-D-Thr (SEQ ID NO: 1); Y is the group attached to the C-terminal of the last amino acid of the sequence P, and is selected from —NH2, —OH, —OR2 and —NHR2; R2 is a radical selected from (C1-C6)-alkyl and (CH2)2—NH—C(?O)—CH2—O—NH2; k is 0-2; m is 0-1; with the proviso that when the biradical X is —C(?O)(CH2)rC(?O)—, then R1 is H; when the N of the amino acid of the sequence P

Abstract: Compounds of formula (I), where R1 and R3 are H or (C1-C4)-alkyl; R2 is H or a C-radical derived from one of the known ring systems with 1-4 rings; X1 is a (C1-C6)-alkyl biradical derived from a linear or branched carbon chain; and X2 is —NH—, —NH—(CH2)1-3—COO—, —NH—(CH2)1-3—S—, or —NH—CO—(CH2)1-3—S—, are useful as blood-brain barrier shuttles (BBB). BBB shuttle-cargo constructs, the cargo being a substance susceptible to form an amide or an ester or a disulfide bound with X2 and being unable to cross the blood-brain barrier by itself, are useful as medicaments.

Abstract: Compounds of formula (I), where R1 and R3 are H or (C1-C4)-alkyl; R2 is H or a C-radical derived from one of the known ring systems with 1-4 rings; X1 is a (C1-C6)-alkyl biradical derived from a linear or branched carbon chain; and X2 is —NH—, —NH—(CH2)1-3—COO—, —NH—(CH2)1-3—S—, or —NH—CO—(CH2)1-3—S—, are useful as blood-brain barrier shuttles (BBB). BBB shuttle-cargo constructs, the cargo being a substance susceptible to form an amide or an ester or a disulfide bound with X2 and being unable to cross the blood-brain barrier by itself, are useful as medicaments.