[ClH:1].O1CCOCC1.C(OC([N:15]1[CH2:28][C:18]2=[C:19]3[N:24]([N:25]=[C:17]2[CH2:16]1)[C:23]([CH3:26])=[C:22]([CH3:27])[CH:21]=[N:20]3)=O)(C)(C)C>CO>[ClH:1].[ClH:1].[CH3:27][C:22]1[CH:21]=[N:20][C:19]2[N:24]([N:25]=[C:17]3[CH2:16][NH:15][CH2:28][C:18]3=2)[C:23]=1[CH3:26]A 4M solution of HCl in 1,4-dioxane (10 mL; 40 mmol; 82.4 eq.) was added to a solution 6,7-dimethyl-1H,3H-2,4,7a,8-tetraaza-cyclopenta[a]indene-2-carboxylic acid tert-butyl ester (140 mg; 0.49 mmol; 1 eq.) in MeOH (2 mL) and the resulting mixture was stirred at room temperature for 18 hours then concentrated in vacuo. The residue was triturated in EtOH and the precipitate filtered off and dried to afford the title compound (78 mg, 62%) as a pale yellow solid. 1H NMR (DMSO-d6) δ 10.39 (br s, 2H), 8.91 (d, J=0.9 Hz, 1H), 6.24 (br s, 1H), 4.51-4.48 (m, 4H), 2.49 (s, 3H), 2.26 (s, 3H). HPLC (max plot) 99.9%; Rt 1.03 min. UPLC/MS: (MS+) 189.0 ([M+H]+).
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