Structure overview:
1. Aromatic core: a pyridine ring (six-membered aromatic ring, one nitrogen at ring position 1).
2. Ring substituents   
   - Carbon 2 (alpha to the ring nitrogen) bears a chlorine atom.  
   - Carbon 6 (the other alpha position) bears a second chlorine atom.  
   - Carbon 5 (meta to the ring nitrogen) carries a side chain.

3. Details of the side chain at carbon 5
  - The side chain stars from a sulfonyl group, with the sulfur directly attached to that ring carbon, doubly bonded to two oxygens, and single-bonded to an exocyclic nitrogen, forming a sulfonamide linkage (-SO2-NR-).

4. Substituent on the sulfonamide nitrogen  
   - The chain starts with a two-carbon ethyl group (N-CH2-CH2-).  
   - This is followed by an ether oxygen (-O-).  
   - After the oxygen come two more methylenes (-CH2-CH2-).  
   - The chain terminates with a vinyl group (-CH=CH2); the double bond is terminal and has no defined E/Z stereochemistry.