ChemInform Abstract: Two Novel Tetracycles, Cassibiphenols A (I) and B (II) from the Flowers of Cassia siamea. Issue 31 (5th August 2014) - Deguchi, Jun; Sasaki, Tadahiro; Hirasawa, Yusuke; Kaneda, Toshio; Kusumawati, Idha; Shirota, Osamu; Morita, Hiroshi