(S)-2-({3-[4-(6-Fluoro-benzothiazol-2-ylamino)-phenyl]-isoxazole-5-carbonyl}-amino)-3-hydroxyl-propionic acid methyl ester → (S)-2-({3-[4-(6-Fluoro-benzothiazol-2-ylamino)-phenyl]-isoxazole-5-carbonyl}-amino)-3-hydroxy-propionic acid

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(S)-2-({3-[4-(6-Fluoro-benzothiazol-2-ylamino)-phenyl]-isoxazole-5-carbonyl}-amino)-3-hydroxyl-propionic acid methyl ester was hydrolyzed by IN NaOH in MeOH to obtain the title compound in 53% yield. Mass (ES−): 443 (M++1); IR (KBr): 3435 (br), 3306, 171718, 1683, 1609, 1590, 1571 (br), 1439; 1H NMR (DMSO-d6) δ: 3.83 (m, 2H), 4.47 (m, 1H), 7.20 (m, 1H), 7.66 (m, 1H), 7.73 (s, 1H), 7.78 (m, 1H), 7.94 (br, 4H), 8.95 (d, 1H), 10.89 (br, COOH).

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