The core of the molecule is a fully saturated piperazine ring, a six-membered heterocycle with nitrogen atoms at positions 1 and 4.
  - At nitrogen-1 of the piperazine, the ring is extended to a piperidine ring (a six-membered saturated heterocycle with one nitrogen). The linkage is to the ring carbon directly opposite the piperidine nitrogen (i.e., the carbon in the 4-position relative to the piperidine nitrogen).
  - At nitrogen-4 of the piperazine, the substituent is a methylene group (-CH2-), which connects directly to a cyclopropyl ring (a three-carbon saturated carbocycle).