Bisgerayafoline A (1) was obtained as an off-white, amorphous
powder. The UV spectrum showed absorptions at 222, 233,
245, and 315 nm, which are typical for an angular pyrano
carbazole skeleton.13 The IR spectrum displayed absorption
bands at 3443 (OH), 3360 (NH), and 1079 (C−O) cm−1
. The