trans-1,3-Diphenyl-2,3-epoxypropan-1-one has been reported to efficiently participate in gas-phase Meerwein reaction under both electrospray ionization (ESI) and atmospheric pressure chemical ionization (APCI) conditions. Therapeutic potential of trans-1,3-diphenyl-2,3-epoxypropane-1-one (DPEP), and its anti-inflammatory effects have been studied.