1'-(4-(Dimethylamino)butyl)-3,4-dihydrospiro(naphthalene-1(2H),3'-pyrrolidine)-2',5'-dione 74246-96-1 BRN 1548350 Spiro(naphthalene-1(2H),3'-pyrrolidine)-2',5'-dione, 3,4-dihydro-1'-(4-(dimethylamino)butyl)-, (+-)-