 Dose Level I - 0.2 mg single oral dose of AEF0117 given on the morning of Day 1 Dose Level II - 0.6 mg single oral dose of AEF0117given on the morning of Day 1 Dose Level III - 2 mg single oral dose of AEF0117 given on the morning of Day 1 Dose Level IV - 6 mg single oral dose of AEF0117 given on the morning of Day 1 The planned dose escalation schema may be amended based on the emerging PK and safety data. Each subject will participate in only one dose group. 