Catalysis of the reaction: ATP + 3-oxo-2-(2'-pentenyl)-cyclopentane-1-octanoic acid + coenzyme A = AMP + diphosphate + 3-oxo-2-(2'-pentenyl)-cyclopentane-1-octanoyl-CoA + H+. 3-oxo-2-(2'-pentenyl)-cyclopentane-1-octanoic acid is also known as OPC-8:0.