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Multiband photometry of the first interstellar comet 2I/Borisov (C/2019 Q4) with coma was performed with the 0.6-m telescope at the Caucasus Mountain Observatory (CMO) of SAI MSU over October-December 2019. The comparison of the integral spectral reflectance of comet 2I with its simulated reflectance spectra allowed us to assess the chemical-mineralogical composition of the cometary coma dust matter as a predominant mixture of Fe-Mg and tholines submicron aggregate particles.