Patent ID: 8440851

Claim:
A compound of formula W-T-X, wherein T is selected from the group consisting of wherein: W is selected from the group consisting of —OH, —NH 2 and —NHR 3 , wherein R 3 is unsubstituted methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, n-butyl, isobutyl or sec-butyl, and X is —NH 2 or —NHR 3 , wherein R 3 is unsubstituted methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, n-butyl, isobutyl or sec-butyl; (W) indicates the point of attachment of T to W; and (X) indicates the point of attachment of T to X, and W and/or X may be optionally protected by one or more protecting groups.