| 摘要 |
The ester of formula (I) is made by (a) reaction of the pyridine salt of glycollic acid (O-protected) with 2-hydroxy 3-(2-methoxy phenoxy) carbamate in an inert. anhydrous organic solvent at ambient temp. in presence of a condensing agent and catalyst; (b) sepn. of the O-protected ester and removing the protective gp. with HBr or HCl in trifluoroacetic or trichloracetic acid. ..ER ALL
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