BALANOCARPOL AND HEIMIOL A, TWO RESVERATROLS DIMER FROM STEM BARK Hopea mengarawan (Dipterocarpaceae) - Atun, Sri; Chemistry Education, Faculty of mathematic and science, Universitas Negeri Yogyakarta, Karangmalang, Yogyakarta, 55281 (Universitas Gadjah Mada, 2010)