[N+:1]([C:4]1[CH:15]=[C:14]2[C:7]([NH:8][CH:9]=[C:10]2[CH2:11][CH2:12][NH2:13])=[CH:6][CH:5]=1)([O-:3])=[O:2].[C:16](OC(=O)C)(=[O:18])[CH3:17]>N1C=CC=CC=1>[N+:1]([C:4]1[CH:15]=[C:14]2[C:7](=[CH:6][CH:5]=1)[NH:8][CH:9]=[C:10]2[CH2:11][CH2:12][NH:13][C:16](=[O:18])[CH3:17])([O-:3])=[O:2]5-Nitrotryptamine (6 mmol) is dissolved in pyridine (15 ml) and treated with acetic anhydride (7 mmol) 20 min at 27° C. The solvents are removed in vacuo, the residue taken into a small amount of methanol and passed through a short plug of silica with 5% methanol-chloroform eluent. Product-containing fractions are pooled, evaporated and dried thoroughly at <0.1 mm Hg.
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