异硫氰酸荧光素酯 、 以
aq. phosphate buffer 、
二甲基亚砜 为溶剂,
以83.4%的产率得到(2S)-6-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(4S)-4-carboxy-1-hydroxy-4-[[4-[(4-hydroxy-2-imino-1H-pteridin-6-yl)methylamino]benzoyl]amino]butylidene]amino]-6-[[[(3',6'-dihydroxy-3-oxospiro[2-benzofuran-1,9'-xanthene]-5-yl)amino]-sulfanylmethylidene]amino]-1-hydroxyhexylidene]amino]-1-hydroxy-3-methylbutylidene]amino]-1-hydroxy-5-[(C-hydroxycarbonimidoyl)amino]pentylidene]amino]-2-(1-hydroxyethylideneamino)hexanoic acid