N-Decanoyl cyclopentylamide (C10-CPA) is a potent inhibitor of quorum sensing in Pseudomonas aeruginosa. N-Decanoyl cyclopentylamide interferes with expression of Pseudomonas aeruginosa virulence factors regulated by the las and rhl quorum-sensing systems. N-Decanoyl cyclopentylamide inhibits production of elastase , pyocyanin, and rhamnolipid and biofilm formation.