1-氨基海因 、 D,L-α-isocyanato-2-thiopheneacetic acid, ethyl ester 以
1,4-二氧六环 为溶剂,
以of DL-α-[[[(2,4-dioxo-1-imidazolidinyl)-amino]carbonyl]amino]-2-thiopheneacetic acid, ethyl ester is obtained的产率得到D,L-α-[[[(2,4-dioxo-1-imidazolidinyl)-amino]carbonyl]amino]-2-thiopheneacetic acid,ethyl ester