"Paradichlorobenzene" was first uploaded on September 19, 2009 at 3:55 AM (following the Benzene Series' pattern of videos being uploaded at the same time each year). It's the third song to the Benzene Series, and the most notable track of the series with over 2 million views. "Paradichlorobenzene" is said by Owata-P to be a song with no meaning, though later to be revealed there is. Like the previous songs, "Paradichlorobenzene" is named after a chemical compound, C6H4Cl2. A "reply" song was also uploaded one year later: "Antichlorobenzene" sung by Rin.