C(N[C:10]([N:12]([CH2:21][CH2:22][CH2:23][CH2:24][CH3:25])[C:13]1[N:14]=[CH:15][NH:16][C:17]=1[C:18]([NH2:20])=[O:19])=[S:11])(=O)C1C=CC=CC=1.[OH-].[Na+].Cl>O>[CH2:21]([N:12]1[C:13]2[N:14]=[CH:15][NH:16][C:17]=2[C:18](=[O:19])[NH:20][C:10]1=[S:11])[CH2:22][CH2:23][CH2:24][CH3:25]A mixture of 4-[[(benzoylamino)carbonothioyl](pentyl)amino]-1H-imidazole-5-carboxamide (11.8 g, 0.0263 mol) and 1 M of sodium hydroxide in water (75 mL) was heated to reflux for 3 h. Solid was formed in the reaction mixture. The reaction mixture was adjusted to pH 3-4 with concentrated HCl with cooling in an ice bath. The solid was filtered, washed with water and air-dried to give the product (9.0 g, 65% purity, 94% yield). The product was used for the next step without further purification. LCMS calculated for C10H15N4OS (M+H): 239.1; found: 239.1.
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