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- [41] Determination of free N-acetylneuraminic acid in urine by high-performance liquid chromatography using 3-[(1-{[4-(5,6-dimethoxy-1-oxoisoindolin-2-yl)-2-methoxyphenyl]- sulfonyl}pyrrolidin-2-yl)carbonylamino]phenylboronic acid as a fluorescent labeling reagent JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES, 2003, 788 (02): : 401 - 405