136075-60-0 L 691121 L-691,121 L-691-121 Methanesulfonamide, N-(1'-(2-(2,1,3-benzoxadiazol-5-yl)ethyl)-3,4-dihydro-4-oxospiro(2H-1-benzopyran-2,4'-piperidin)-6-yl)-, monohydrochloride Methanesulfonamide, N-(1'-(2-(5-benzofurazanyl)ethyl)-3,4-dihydro-4-oxospiro(2H-1-benzopyran-2,4'-piperidin-6-yl)-, monohydrochloride