Patent ID: 8614290

Claim:
A compound, or a pharmaceutically acceptable salt or ester thereof, comprising the structure: [(P1-S1 j ) p -L-(S2 q -P2) r ] t wherein: P1 and P2, which may be the same or different, are cyclic oligopeptide moieties, at least one of P1 and P2 having the motif B-Arg or B-(Me)Arg within the cyclic moiety, wherein B is an Nα-methyl derivative of a basic amino acid, or an N α -methyl derivative of phenylalanine; S1 and S2 are spacer groups, which may be the same or different; L is a linker moiety containing at least two functional groups for attachment of the cyclic oliqopeptides or spacer groups; j and q are independently 0 or 1; p and r are independently integers of 1 or more; and t is an integer of 1 or more, provided that, when t, p or r is greater than 1, the cyclic oliqopeptide moiety, spacer group and/or the value of j or q may be the same or different between the multiple (P1-S1 j ) moieties or multiple (S2 q -P2) moieties.