Herein we report the synthesis of 6-(7,8-dimethyl-2,4-dioxo-3,4-dihydrobenzo[g]pteridin-10(2H)-yl)hexyl 5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanoate. The compound was fully characterized by melting point, 1H-, 13C-NMR spectroscopy, IR spectroscopy, UV-VIS spectroscopy, mass spectrometry, and elemental analysis. The obtained data confirmed the successful synthesis and structure of the novel molecule.