[O:1]=[C:2]1[NH:7][C:6]2[CH:8]=[CH:9][C:10]([NH:12][C:13](=[O:17])[C:14]([OH:16])=O)=[CH:11][C:5]=2[O:4][CH2:3]1.[O:18]([CH:25]1[CH2:30][CH2:29][N:28](C)[CH2:27][CH2:26]1)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1.[CH2:32](OCC)C>>[O:16]=[C:14]([N:28]1[CH2:27][CH2:26][CH:25]([O:18][C:19]2[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=2)[CH2:30][CH:29]1[CH3:32])[C:13]([NH:12][C:10]1[CH:9]=[CH:8][C:6]2[NH:7][C:2](=[O:1])[CH2:3][O:4][C:5]=2[CH:11]=1)=[O:17]The title compound is prepared from N-(3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-7-yl)-oxalamic acid (Example 53b) and 4-phenoxy-methyl-piperidine [DE 254 999 (1977)] according to the method described in Example 1c. Melting Point: 215-217° C. (diethylether)
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