The structure of spiro-(fluorene-9,4’-imidazolidine)-2’,5’-dithione was verified by 1D (¹H, ¹³C, DEPT 135) and 2D NMR (¹H-¹H COSY, HMQC and HMBC) spectroscopy. Additionally, the completely assigned NMR data was supported by Raman band assignments. HOSE predictions were incorporated by using the open-access NMRShiftDB database for verification of the assigned ¹³C NMR chemical shifts.