The amount of 2-acetylhexanoic acid in dichloromethane from Example 15A is treated with 2.3 g (17.0 mmol) of 1-hydroxy-1H-benzotriazole and 3.44 g (34 mmol) of 4-methylmorpholine and cooled to −20° C. After addition of 3.26 g (17.0 mmol) of N′-(3-dimethylaminopropyl)-N-ethylcarbodiimide hydrochloride, the mixture is stirred for 30 min. The cooling bath is removed in the course of this. 1.60 g (6.55 mmol) of 6-(1-aminoethyl)-3-(4-methylbenzyl)-1,2,4-triazin-5(4H)-one (Example 8A) are then added after fresh cooling to −20° C. and the mixture is stirred overnight while warming to room temperature. For work-up, the dichloromethane phase is washed with 1 N potassium hydrogensulphate solution and then with saturated sodium hydrogencarbonate solution. The dried organic phase is concentrated and chromatographed using the eluent dichloromethane/methanol 100/1 to 30/1.
