In a similar manner to Example 1, t-butyl 4-[3-(6-thiocarbamoylpyrid-3-ylcarbonyl)ureido]phenoxyacetate (2.73 g) was reacted with iodomethane (13 ml) and acetone (200 ml) and the resultant product was treated with ammonium acetate (6 g), methanol (30 ml) and dichloromethane (30 ml) at ambient temperature. This yielded a crude solid which was collected and washed with methanol and acetone to give the title compound (1.68 g) as an orange solid: m.p. 290°-300° C. (decomposes); NMR Spectrum (DMSO-d6) 1.43 (9H, s), 1.82 (3H, s), 4.62 (2H, s), 6.90 (2H, d), 7.49 (2H, d), 8.29 (1H, d), 8.52 (1H, dd), 9.18 (1H, d) 10.61 (1H, s); Mass Spectrum m/Z 414 (M+H)+ ; Elemental Analysis: calculated for C20H23N5O5. 1.0 CH3CO2H. 0.5 H2O: C, 54.8%; H, 5.85%; N, 14.5%; found: C, 54.6%; H, 6.0%; N, 14.5%
