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New coordination compounds of copper(I) have been synthesized: [Cu2L 21 Cl2] (I) and [Cu2(HL2)2Br2] (II), where L1 is methyl 3-[(3,5-dimethyl-pyrazole-1-carbothioyl)-amino]-propionate, and HL2 is ethyl [(3,5-dimethyl-pyrazole-1-carbothioyl)-amino]-acetate. X-ray diffraction analysis showed that the crystal structures of these compounds are built from binuclear molecules. The L1 and HL2 molecules...