Penentuan struktur molekul senyawa kimia dari bunga kayu buta-buta (Excoecaria Agallocha L) dan uji anti bakteri terhadap ekstrak petroleum eter, etil asetat dan etanol = The elucidation of molecular structure of compounds extracted from flowers of excoecaria agallocha L. and anti bacterial test its petroleum ether, ethyl acetate and ethanol extracts