1. There is a five-membered, nitrogen-containing ring (four carbons and one nitrogen, i.e., a pyrrolidine ring). Label its atoms N1-C2-C3-C4-C5 in a clockwise manner, so that N1 is the ring nitrogen.
2. At C3, there is also a hydroxyl group and a side chain attached. This side chain is connected via a single carbon to a secondary amine (NH) group, making the configuration of C3 an R-stereocenter.
3. The secondary amine (NH) group has another substituent, which is a piperidine ring (a saturated six-membered ring composed of one nitrogen and five carbon atoms). In the piperidine ring, the secondary amine substituent is located at the para position relative to the piperidine nitrogen. Additionally, the piperidine nitrogen is bonded to an sp2-hybridized carbon, which forms an imine (C=N) with another nitrogen and is also attached to a hydroxyl group.
4. The imine nitrogen is further connected to a phenyl ring that has no other substituents.