Bruceolline D: 3,3-dimethyl-1H,4H-cyclo­penta­[b]indol-2(3H)-one

The title compound, C₁₃H₁₃NO, crystallizes with four independent mol­ecules in the asymmetric unit. The 12-membered penta­[b]indole rings are essentially planar, with maximum deviations ranging from 0.034 (4) to 0.036 (4) Å in the four unique mol­ecules. In the crystal, weak C—H...O inter­actions are observed, which link the mol­ecules into chains along [010].

(2S*,5R*)-2,5-Dimethyl-1,4-bis­(pyridin-2-ylmeth­yl)piperazine

The title compound, C₁₈H₂₄N₄, resides on a crystallographic inversion centre, so that the asymmetric unit comprises one half-mol­ecule. The piperazine ring adopts a chair conformation, with the mean planes of the two equatorial pyridine rings parallel to each other and separated by 2.54 (3) Å. No classical hydrogen bonds are observed.