Core skeleton: a pyridine ring (six-membered aromatic ring with two nitrogens in a para, 1/4 arrangement). Number the atoms with nitrogens at positions 1 and 4.

All four carbons in this ring bear distinct substituents:
- C2: bears an ethyl group.
- C3: bears a secondary amino group (-NH-); this nitrogen is bonded to an sp3 carbon that carries two ethyl groups.
- C5: bears a chlorine atom.
- C6: bears a benzene ring, and this benzene is further substituted with two chlorine atoms located at the ortho and para positions relative to the point of attachment.

No chiral centers or E/Z double bonds are present.