(S)-1,1-dimethylethyl <(2-amino-4-methylpentyl)thio>acetate 、
5-甲基-2-噻吩甲酸 、
1-羟基苯并三唑 、 以to give 0.64 g of (S)-1,1-dimethylethyl [[4-methyl-2-[[[5-methyl-2-thienyl]carbonyl]amino]pentyl]thio]acetate as a crystalline solid, mp 81°-83°的产率得到{(S)-4-Methyl-2-[(5-methyl-thiophene-2-carbonyl)-amino]-pentylsulfanyl}-acetic acid tert-butyl ester