[CH:1]1[CH:5]=[C:4]([CH2:6][N:7]([CH2:11][CH2:12][Cl:13])[CH2:8][CH2:9][Cl:10])[S:3][CH:2]=1.[ClH:14].[Br-].CN(C=O)C.C(N(CC)CC)C.CC(OCC1C2C(=CC=CC=2)C(COC(C)=O)=C2C=1C=CC=C2)=O>O=O>[CH:1]1[CH:5]=[C:4]([CH2:6][N:7]([CH2:11][CH2:12][Cl:13])[CH2:8][CH2:9][Cl:10])[S:3][CH:2]=1.[ClH:14]One millimole of DCTA-bromide was added to 5 ml of DMF containing 0.2 ml of 1,2-dithioethylene and 0.5 ml of triethylamine. The mixture was incubated under argon for 2 hours at 60°-70° C. After reaction the mixture was diluted with oxygen-free H2O to 50 ml, the pH was adjusted to 4.0-4.5 with glacial acetic
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