The mol-ecular conformation of the title compound, C(20)H(29)N(3)O(2), is stabilized by an intra-molecular C-H⋯O hydrogen bond. The orientation of the amide group to the ring system is characterized by a C-C-C-O dihedral angle of 137.5 (3)°. In the crystal, inter-molecular N-H⋯O hydrogen bonds between the amide groups form C(4) chains running parallel to the a axis.