The crystal structures of 6'-(4-chloro-phen-yl)- and 6'-(4-meth-oxy-phen-yl)-6a'-nitro-6a',6b',7',9',10',12a'-hexa-hydro-2H,6'H,8'H-spiro-[ace-naphthyl-ene-1,12'-chromeno[3,4-a]indolizin]-2-one.

In the title compounds, C(32)H(25)ClN(2)O(4) (I) and C(33)H(28)N(2)O(5) (II), the six-membered pyran and piperidine rings adopt envelope and chair conformations, respectively. The five-membered pyrrolidine rings adopt twist conformations. Compound (II) crystallizes with two independent mol-ecules (A and B) in the asymmetric unit. In all three mol-ecules there is a C-H⋯O intra-molecular hydrogen bond present enclosing an S(7) ring motif. In (I), both oxygen atoms of the nitro group are disordered, while in (II) the meth-oxy-benzene group is disordered in mol-ecule B. The geometries were regularized by soft restraints. In the crystal of (I), mol-ecules are linked by C-H⋯O hydrogen bonds, forming chains along [010]. The chains are linked by C-H⋯Cl hydrogen bonds, forming layers parallel to (10). Within the layer there are C-H⋯π inter-actions present. In the crystal of (II), the A and B mol-ecules are linked via C-H⋯O hydrogen bonds, forming a square four-membered A-B-A-B unit. These units are linked by a number of C-H⋯π inter-actions, forming a three-dimensional supra-molecular structure.