[CH2:1]([N:3]1[CH:8]=[C:7]([N:9]2[CH2:13][CH2:12][CH2:11][CH2:10]2)[C:6]2[CH:14]=[CH:15][C:16]3[C:21]([C:5]=2[S:4]1(=[O:23])=[O:22])=[CH:20][CH:19]=[CH:18][CH:17]=3)[CH3:2].[C:24](Cl)([Cl:26])=[O:25]>>[CH2:1]([N:3]1[C:8]([C:24]([Cl:26])=[O:25])=[C:7]([N:9]2[CH2:13][CH2:12][CH2:11][CH2:10]2)[C:6]2[CH:14]=[CH:15][C:16]3[C:21]([C:5]=2[S:4]1(=[O:23])=[O:22])=[CH:20][CH:19]=[CH:18][CH:17]=3)[CH3:2]2-Ethyl-4-(1-pyrrolidyl)-2H-naphtho[2,1-e]-1,2-thiazine-3-carboxylic acid chloride-1,1-dioxide was prepared analogous to Example 55b from 2-ethyl-4-(1-pyrrolidyl)-2H-naphtho[2,1-e]-1,2-thiazine-1,1-dioxide and phosgene and recovered in the form of a solution in tetrahydrofuran.
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