[NH2:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[S:8][CH2:9][CH:10]([C:14]1[CH:19]=[CH:18][C:17]([O:20][CH3:21])=[C:16]([O:22][CH3:23])[CH:15]=1)[C:11](O)=[O:12].C(Cl)Cl.Cl.C(N=C=NCCCN(C)C)C>C(N(CC)CC)C>[CH3:23][O:22][C:16]1[CH:15]=[C:14]([CH:10]2[C:11](=[O:12])[NH:1][C:2]3[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=3[S:8][CH2:9]2)[CH:19]=[CH:18][C:17]=1[O:20][CH3:21]A solution of 9.1 g of the product of Step C, 180 ml of methylene chloride, 6.25 g of 1-ethyl-3-(3-dimethylamino propyl) carbodiimide hydrochloride and 9 ml of triethylamine was stirred for 90 minutes at ambient temperature and the methylene chloride was evaporated off. The residue was taken up in 90 ml of ethyl acetate and after separation, 7.8 g of the expected product were obtained melting at 174° C. An analytical sample was obtained by crystallization of 200 mg of crude product from 10 ml of ethyl acetate to obtain 120 mg of the desired product melting at 184° C.
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