1,2,3,6-Tetrahydro-4-ethynyl-1,2,2,6,6-pentamethylpyridine hydrochloride 4-Ethynyl-1,2,2,6,6-pentamethyl-1,2,3,6-tetrahydropyridine hydrochloride 63905-91-9 Pyridine, 1,2,3,6-tetrahydro-4-ethynyl-1,2,2,6,6-pentamethyl-, hydrochloride Pyridine, 4-ethynyl-1,2,2,6,6-pentamethyl-1,2,3,6-tetrahydro-, hydrochloride