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- [21] APPLICATION OF XANTHENE DERIVATIVES FOR ANALYTICAL-CHEMISTRY .42. COLOR-REACTION BETWEEN KETO ACID OR HYDROXY ACID AND 9-(2'-CARBOXYPHENYL)-4,5-DIBROMO-2,3,7-TRIHYDROXY-6-FLUORONE ALUMINUM(III) COMPLEX AND ITS APPLICATION TO THE DETERMINATION OF BETA-PHENYLPYRUVIC ACID CHEMICAL & PHARMACEUTICAL BULLETIN, 1985, 33 (01) : 242 - 248