Start with a six-membered saturated ring numbered C1 to C6 clockwise. C4 is quaternary and bears two methyl groups (gem-dimethyl).

At C1, the ring carries a secondary amine (-NH-). This nitrogen is bonded to one hydrogen and to a chiral carbon C* that initiates a second ring system; C* is R-configured.

The second ring system comprises a six-membered saturated heterocycle with one nitrogen (a piperidine) that is para to the chiral carbon C*, fused to an imidazole. The imidazole is a five-membered aromatic ring with two nitrogens in a 1,3 ("meta") relationship. The fusion occurs by sharing one nitrogen and one adjacent carbon between the two rings; the other imidazole nitrogen lies adjacent to the shared carbon. There are no additional substituents on this fused ring system.