title: Diethyl 6H,12H-5,11-methano-dibenzo[b,f][1,5]diazo-cine-1,7-dicarboxyl-ate.
abstract: In the mol-ecule of the title compound, C(21)H(22)N(2)O(4), the 1,7-diethyl ester analogue of Tröger's base, the dihedral angle between the two benzene rings is 93.16 (3)°; the mol-ecule is C(2) symmetric.
authors.forename: M Delower H
authors.initials: MD
authors.lastname: Bhuiyan
authors.forename: Jack K
authors.initials: JK
authors.lastname: Clegg
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Try