[Cl:1][C:2]1[CH:3]=[C:4]([N:9]2[CH2:15][C@@H:14]3[C@@H:11]([CH2:12][NH:13]3)[CH2:10]2)[CH:5]=[N:6][C:7]=1[Cl:8].[C:16]([OH:23])(=[O:22])/[CH:17]=[CH:18]\[C:19]([OH:21])=[O:20].O.N>C1COCC1.CO>[C:16]([OH:23])(=[O:22])/[CH:17]=[CH:18]\[C:19]([OH:21])=[O:20].[Cl:1][C:2]1[CH:3]=[C:4]([N:9]2[CH2:15][C@@H:14]3[C@@H:11]([CH2:12][NH:13]3)[CH2:10]2)[CH:5]=[N:6][C:7]=1[Cl:8]Under N2, to a solution of the product of Example 5J (122 mg, 0.5 mmol) in THF (5 mL) was slowly added the solution of maleic acid (70 mg, 0.6 mmol) in MeOH (0.6 mL). The mixture was then stirred at ambient temperature for 6 h. White solid started to precipitate. The solid was then filtered and dried (140 mg, yield, 78%). M.p. 160–163° C. Solubility: 7.5 mg/mL (water). 1H NMR (CD3OD, 300 MHZ) δ 3.07 (dd, J=10.5, 6.5 Hz, 1H), 3.18 (dd, J=12.2, 4.7 Hz, 1H), 3.44–3.56 (m, 1H), 3.73 (dd, J=10.5, 4.8 Hz, 1H), 3.91 (d, J=10.5 Hz, 1H), 4.11 (d, J=12.2 Hz, 1H), 4.26 (dd, J=10.9, 8.5 Hz, 1H), 5.05 (dd, J=7.2, 5.1 Hz, 1H), 6.27 (s, 2H), 7.53 (d, J=2.7 Hz, 1H), 7.96 (d, J=2.9 Hz, 1H) ppm. MS (DCI/NH3) m/z 244 (M+H)+, 246 (M+H)+.
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