[C:1]([CH2:4][C:5]1[CH:13]=[C:12]([Br:14])[C:11]([O:15][CH3:16])=[CH:10][C:6]=1[C:7](O)=[O:8])(O)=[O:2].[NH2:17]C(N)=O>O>[Br:14][C:12]1[CH:13]=[C:5]2[C:6](=[CH:10][C:11]=1[O:15][CH3:16])[C:7](=[O:8])[NH:17][C:1](=[O:2])[CH2:4]22-Carboxymethyl-4-bromo-5-methoxy-benzoic acid (228 mg, 0.785 mmole) and urea (0.110 g, 1.82 mmole) is stirred and heated using an oil bath at 195° C. After one hour the mixture is cooled to room temperature and treated with water, collected by filtration, washed with water and dried to give a brown-black solid, 106 mg, (50%); MS (ES−): m/z 268.1, 270.1 (M−H).
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