He is wanted for questioning.
The noxious substance was sprayed in Mangle nightclub in Dalston.
Police are searching for Arthur Collins, the 25-year-old boyfriend of reality television personality Ferne McCann.
Police are still searching for 25-year-old Arthur Collins, the boyfriend of reality TV star Ferne McCann.
Arthur Collins is due to appear in court charged in connection with the incident at an east London nightclub.
Jeffrey Wiltshire, 52, and Rosalin Baker, 25, were on trial at the Old Bailey for murdering 16-week-old Imani.
The 24-year-old was arrested at an address in Rushden, Northamptonshire, on Saturday.
Four fire engines and a number of specialist fire appliances including a foam lorry were involved in the operation.
Ten people were taken to hospital for burns, while two others with similar injuries sought treatment, emergency services said.