[OH:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][C:9](=[O:13])[C:10]([OH:12])=[O:11])=[CH:4][CH:3]=1.[C:14]([OH:22])(=[O:21])[CH2:15][C:16](C(O)=O)=O.Cl.[NH2:24][OH:25].Cl>[OH-].[K+].O>[OH:13][C:9]([CH2:8][C:5]1[CH:4]=[CH:3][C:2]([OH:1])=[CH:7][CH:6]=1)([C:10]([OH:12])=[O:11])[CH2:16][C:15](=[N:24][OH:25])[C:14]([OH:22])=[O:21]To 10 ml of water in which were dissolved 3.18 g of potassium hydroxide, were added 1.0 g (5.55 mmol) of 4-hydroxyphenylpyruvic acid and 2.2 g (16.7 mmol) of oxalacetic acid, for reaction at ambient temperature for 72 hours (about pH 13 at the start of the reaction). Hydroxylamine hydrochloride salt of 1.54 g (22.2 mmol) was added to the reaction solution, for reaction at ambient temperature for 10 hours. The reaction solution was then adjusted to pH 2.6, using 6N hydrochloric acid, for extraction using ethyl acetate. The organic layer was rinsed with aqueous saturated sodium chloride, dried over anhydrous magnesium sulfate and concentrated to dryness, to obtain 0.7 g (2.47 mmol) of 4-hydroxy-4-(4-hydroxyphenylmethyl)-2-hydroxyiminoglutaric acid as a crude product. Further, the crude product was recrystallized in methanol and toluene, to obtain 0.22 g (0.78 mmol) of 4-hydroxy-4-(4-hydroxyphenylmethyl)-2-hydroxyiminoglutaric acid in crystal. NMR Measurement
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