1. Begin with a benzene ring. At one ring carbon (designated C-1), attach a methylene (-CH2-) group that leads into a piperidine ring. Number the piperidine such that its nitrogen is N-1 (bonded to the benzylic CH2), and continue numbering around the ring as C-2, C-3, C-4, C-5, and C-6.
2. At piperidine C-4, attach an oxygen atom linked to a three-carbon chain: -O-CH2-CH2-CH2-. The terminal carbon of this chain (the third carbon from the oxygen) is bonded to a nitrogen atom (designated N-2).
3. N-2 is part of a guanidino-like unit. Specifically, N-2 is bonded to a central carbon (C-7) that is double-bonded to a nitrogen atom (N-3) and single-bonded to a third nitrogen atom (N-4). N-4, in turn, is bonded to a cyclopentane ring (a fully saturated five-carbon ring), and N-3 bears a methyl group.