The Effective Method of Preparing and Chromatography-Mass Spectrometric Studies of 4(1’,3’-Dithiol-2’-ylidene)hydroquinoline-3-Thione, Hydroquino [3,4-B]-1,6,6a(λ4)tritiapentalene and 1’,3’-Dithiol-2’-Spiro-8-[thiino[2,3-C] Hydroquinoline]. sorpchrom 2019, 14 (4).