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HCl gas was bubbled into a solution of 127 (61 mg, 0.08 mmol) in DCM. The flask was capped and the mixture was stirred at room temperature for 30 min. Formed precipitate was collected by filtration and washed with DCM to afford 128 (52 mg, 84% yield), presumably as a trihydrochloride salt. 1H NMR (400 MHz, DMSO-d6) δ (ppm): 10.59 (s, 1H), 9.34 (br.s, 2H), 8.75 (s, 1H), 8.62 (d, J=5.7 Hz, 1H), 8.43 (s, 11H), 8.38 (d, J=8.5 Hz, 1H), 8.15 (dd, J=8.2, 2.1 Hz, 1H), 7.86 (dd, J=12.9, 2.4 Hz, 1H), 7.62 (d, J=7.6 Hz, 2H), 7.4-7.6 (m, 4H), 7.17 (t, J=7.3 Hz, 1H), 6.81 (d, J=5.5 Hz, 1H), 4.25 (m, 2H), 3.95 (m, 4H), 3.62 (m, 2H), 3.29 (s, 3H), 3.13 (br.s, 2H). MS (m/z): 613.3 (M+H).

1. customThe flask was capped
2. customFormed precipitate
3. filtrationwas collected by filtration
4. washwashed with DCM