Begin with a phenyl ring fused to a six-membered piperidine ring containing a single nitrogen. The nitrogen is adjacent to a fused carbon. A -O-CH2-CH2-O-CH3 group is attached to the phenyl ring at the position para to the piperidine nitrogen. Within the piperidine ring, the carbon adjacent to the nitrogen (not the one shared with the phenyl ring) forms a chiral center (C-alpha) with an R configuration. This chiral center is bonded to an additional phenyl ring that bears a chlorine substituent at the ortho position relative to the linkage. The other two carbons of the piperidine ring are fused to a five-membered ring (designated as C1-C2-C3-C4-C5). In this five-membered ring, C1, a fused carbon adjacent to C-alpha, has an S configuration, C3 is double-bonded to C4, and C5 is another fused carbon with an S configuration.