1. Chemistry Department, Mulawarman University, Samarinda 75119, East Kalimantan, Indonesia
2. Biology Department, Mulawarman University, Samarinda 75119, East Kalimantan, Indonesia
3. Research Center of Natural Products from Tropical Rainforest (PUI PT OKTAL), Mulawarman University, Samarinda 75119, East Kalimantan, Indonesia
4. School of Chemistry, Monash University, Clayton, Victoria 3800, Australia