1'-(4-(Diethylamino)butyl)-3,4-dihydrospiro(naphthalene-1(2H),3'-pyrrolidine)-2',5'-dione 74246-98-3 BRN 1550453 Spiro(naphthalene-1(2H),3'-pyrrolidine)-2',5'-dione, 3,4-dihydro-1'-(4-(diethylamino)butyl)-, (+-)-