2. Males or females. Females must be non-pregnant and non-lactating, and either surgically sterile (hysterectomy, oophorectomy, or tubal ligation) or post-menopausal. Males must be surgically sterile, abstinent or if engaged in sexual relations of child-bearing potential, subject or partner must be using an acceptable contraceptive method during the trial and for 9 weeks after the last dose of study drug.