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4-(3,5-Dichloro-4-ethoxyphenylcarbamoyl)benzoic acid. (Reagents and conditions: (i) (COCl)2,CH2Cl2, DMF, 0 °C, then room temp 2 h; (ii) DIPEA, CH2Cl2, room temp, 16 h, then LiOH, THF, H2O, room temp, 16 h; (iii) K2CO3, EtI, DMF, 65 °C, 18 h, then further EtI, 70 °C, 3 h; (iv) LiOH, THF, H2O, room temp, 5 h).
