A USB female connector includes an insulation body, a circuit board, connecting terminals and electrical-conductive terminals. The Petasites japonicus extract according to the present invention has excellent antioxidant activity, relief of neurotoxicity and neuroprotective effect and thus, can be usefully used in the prevention and treatment of brain diseases such as Alzheimer’s disease, Parkinson’s disease, amyotrophic lateral sclerosis, hypoxic-ischemic injury and chronic spinal cord injury. Targeting ligands, such as folate, can also be attached to the mixed micelles for enhancing drug delivery into cells.