Word: carbomethoxypropionyl
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...dicyanovinyl)-3-methyl-4-ethyl-5-chloromethylpyrrole [m.p. 189-192°], and thence, by condensation with 3-carbethoxy-4-methylpyrrole in hot aqueous etha-nolic hydrochloric acid to 3', 4-dimethyl-3-ethyl-4'-carbethoxy-5-(β, β-dicyanovinyl) dipyrrylmethane [m.p. 195-197°], which, with β-carbomethoxypropionyl chloride in dichloromethane in the presence of anhydrous zinc chloride, gave 3', 4-dimethyl-3-ethyl-4'-carbethoxy-5-(β, β-dicyanovinyl) -5'-(β, β-carbomethoxypropionyl )-dipyrrylmethane...
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