Mitsuhiro Sekiguchi, Yusuke Hirasawa, Kazumasa Zaima, Teh Chin Hoe, Kit-Lam Chan, and Hiroshi Morita, Flavisiamines A - D, New Indole Alkaloids from Kopsia flavida, Heterocycles 2008, 75, 2283-2288.
Mitsuhiro Sekiguchi, Yusuke Hirasawa, Kazumasa Zaima, Teh Chin Hoe, Kit-Lam Chan, and Hiroshi Morita, Flavisamines E - F and Fruticosiamine A, New Methyl Chanofruticosinate- and Aspidofractinine-type Indole Alkaloids, from Two Species of Kopsia, Heterocycles 2008, 76, 867-874.
Koichiro Koyama, Yusuke Hirasawa, Kazumasa Zaima, Teh Chin Hoe, Kit-Lam Chan, and Hiroshi Morita, Alstilobanines A - E, New Indole Alkaloids from Alstonia angustiloba, Bioorg. Med. Chem. 2008, 16, 6483-6488.
Khalit Mohamad, Tomoko Suzuki, Yuki Baba, Kazumasa Zaima, Yosuke Matsuno,Yusuke Hirasawa, Mat Ropi5 Mukhtar, Khalijah Awang, A. Hamid A. Hadi, and Hiroshi Morita, Huncaniterine A, A New Bisindole Alkaloid from Hunteria Zeylanica, Heterocycles 2007, 74, 969-976.
Kazumasa Zaima, Yosuke Matsuno, Yusuke Hirasawa, Abdul Rahman, Gunawan Indrayanto, Noor Cholies Zaini, and Hiroshi Morita, Kopreasin A, A New Indole Alkaloid from Kopsia arborea, Heterocycles 2008, 75, 2535-2540.
Khalijah Awang, Kartini Ahmad, Noel F. Thomas, Yusuke Hirasawa, Koichi Takeya, Mat Ropi Mukhtar, Khalit Mohamad, and Hiroshi Morita, Singaporentine A: A New Indole Alkaloid from Kopsia singapurensis RIDL., Heterocycles 2008, 75, 3051-3056.
Yusuke Hirasawa, Saori Miyama, Wiwied Ekasari, Aty Widyawaruyanti, Abdul Rahman, Idha Kusumawati, Noor Cholies Zaini, and Hiroshi Morita, Alkaloids from the Leaves of Alstonia scholaris, Heterocycles 2009, 79, 1107-1112.
Alfarius E. Nugroho, Yusuke Hirasawa, Nobuo Kawahara, Yukihiro Goda, Khalijah Awang, A. Hamid A. Hadi, and Hiroshi Morita, Bisnicalaterine A, a Vobasine-Vobasine Bisindole Alkaloid from Hunteria zeylanica, J. Nat. Prod. 2009, 72, 1502-1506.
Kazumasa Zaima, Tomoko Hirata, Takahiro Hosoya, Yusuke Hirasawa, Koichiro Koyama, Abdul Rahman, Idha Kusumawati, Noor Cholies Zaini, Motoo Shiro, and Hiroshi Morita, Biscarpamontamines A and B, an Aspidosperma-Iboga Bisindole Alkaloid and An Aspidosperma-Aspidosperma Bisindole Alkaloid from Tabernaemontana sphaerocarpa, J. Nat. Prod. 2009, 72, 1686-1690.
Yusuke Hirasawa, Hiroko Arai, Kazumasa Zaima, Rice Oktarina, Abdul Rahman, Wiwied Ekasari, Aty Widyawaruyanti, Gunawan Indrayanto, Noor Cholies Zaini, and Hiroshi Morita, Alstiphyllanines A-D, Indole Alkaloids from Alstonia macrophylla, J. Nat. Prod. 2009, 72, 304-307.
Yusuke Hirasawa, Saori Miyama, Takahiro Hosoya, Koichiro Koyama, Abdul Rahman, Idha Kusumawati, Noor Cholies Zaini, and Hiroshi Morita, Alasmontamine A, a First Tetrakis Monoterpene Indole Alkaloid from Tabernaemontana elegans, Org. Lett. 2009, ASAP.
