4 5 6 7 tetrahydrothieno 3 2 c pyridine hydrochloride July 8, 2019 16 32 64 128 3 4 5 6-tetrahydro-2-pyrimidinethiol 3 6-di(pyridin-4-yl)-1 2 4 5-tetrazine 4 5 6 7-tetrahydrothieno 2 3-c pyridine 3 6-di(pyridin-2-yl)-1 2 4 5-tetrazine
