Isolasi, Elusidasi Struktur dan Uji Bioaktivitas Kandungan Kimia Fraksi Etil Asetat Kulit Batang Tanaman Calophyllum macrophyllum Scheff = Isolation, elucidation and bioactivity assay of the chemical compounds of ehtyl acetate fraction of the stem bark of Calophyllum marophyllum Scheff - Frengki, author (Universitas Indonesia, 2010)