In order to find HIV drug seeds with inhibitory activity against a HIV multifunctional protein, Vpr, we isolated natural compounds from Myanmar plants and marine sponges, and assessed the potency as the Vpr inhibitor of the isolated compounds. The phytochemical study of Myanmar plants led to isolation of total 13 isopimarane diterpenoids including eight new ones, and revealed that four compounds possessed the Vpr inhibitory activity at the level comparable with that of positive control. Furthermore, investigation of chemical components in Myanmar marine sponges resulted in isolating five pyrrololactams including one new compound, and the one of them was found to be the Vpr inhibitor with potency equivalent to that of the positive control.