1'-(2-(Methylamino)ethyl)-3,4-dihydrospiro(naphthalene-1(2H),3'-pyrrolidine)-2',5'-dione HCl 74246-71-2 Spiro(naphthalene-1(2H),3'-pyrrolidine)-2',5'-dione, 3,4-dihydro-1'-(2-(methylamino)ethyl)-, hydrochloride, (+-)-