[N+:1]([C:4]1[CH:13]=[C:12]2[C:7]([N:8]=[C:9]([O:16]C)[C:10]([O:14]C)=[N:11]2)=[C:6]([CH2:18][N:19]([CH2:28][CH3:29])[C@H:20]([P:22](=[O:27])([O:25]C)[O:23]C)[CH3:21])[CH:5]=1)([O-:3])=[O:2]>Cl>[N+:1]([C:4]1[CH:13]=[C:12]2[C:7]([NH:8][C:9](=[O:16])[C:10](=[O:14])[NH:11]2)=[C:6]([CH2:18][N:19]([CH2:28][CH3:29])[C@H:20]([P:22](=[O:23])([OH:27])[OH:25])[CH3:21])[CH:5]=1)([O-:3])=[O:2]4.24 g (9.9 mmol) of dimethyl (R)-N-(7-nitro-2,3-dimethoxyquinoxalin-5-ylmethyl)-α-ethylaminoethylphosphonate are stirred for 19 hours in 80 ml of 6N hydrochloric acid. The reaction mixture is evaporated and the residue is slurried with water. The title compound is obtained as a solid of m.p.=218° C. (dec.).
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