4-Methyl-2-[3-oxo-3H-isobenzofuran-(1E)-ylideneamino]-pentanoic acid methyl ester 、
二氮杂18-冠醚-6 以
苯 为溶剂,
以35%的产率得到2-(2-{16-[2-(1-Methoxycarbonyl-3-methyl-butylcarbamoyl)-benzoyl]-1,4,10,13-tetraoxa-7,16-diaza-cyclooctadecane-7-carbonyl}-benzoylamino)-4-methyl-pentanoic acid methyl ester