Abstract: A process for the production of a compound of formula (I) wherein ALINKERB represents a linker moiety of formula (V): A[G1-G2*-G3]B; wherein A and B indicate the orientation of the group of formula (V) in formula (I); G1, G2 and G3 have specific meanings described herein and may be present or absent, with the proviso that at least one of G1 or G3 is present; which linker group may furthermore optionally contain one or more groups of formula (VI); and/or other substituents; and R1 represents hydrogen or a C1-C4-alkyl group; R2 represents hydrogen or a C1-C4-alkyl group; R3 independently at each occurrence, represents hydrogen or a C1-C4-alkyl group; x is 0 or 1; y is 0 or 1; z independently at each occurrence, is 0 or 1; and (—) represents a single bond between a primary, secondary or tertiary carbon atom of the moiety ALINKERB and the adjacent nitrogen atom; in which process (A) a compound of formula (II) is reacted with a compound of formula (III) wherein Pr represents an amino protecting group selected from