C(OC([N:8]1[CH2:13][CH2:12][CH:11]([N:14]2[CH:18]=[CH:17][N:16]=[CH:15]2)[CH2:10][CH2:9]1)=O)(C)(C)C>Cl.O1CCOCC1>[N:14]1([CH:11]2[CH2:12][CH2:13][NH:8][CH2:9][CH2:10]2)[CH:18]=[CH:17][N:16]=[CH:15]1The title compound(0.21 g, 0.836 mmoles) from Step C was stirred in 4N HCl in dioxane (5 mL) for 2 h and then evaporated to dryness to give the title compound which was used to couple with the tricylic acid.
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