1: 2,6-bis-trifluoromethyl-benzoic acid 3-[2-(11-tert-butoxycarbonylamino-10-methyl-undecanoylamino)-3-phenyl-propionylamino]-2-oxo-propyl ester With hydrogenchloride in 1,4-dioxane; methanol; water T=20°C; 0.5 h; 2: (5)-carboxy-TAMRA-NHS With N-ethyl-N,N-diisopropylamine in DMF (N,N-dimethyl-formamide) T=20°C; 2 h;