As part of a program to isolate novel antioxidant and
cytotoxic compounds from plants,21-23 the CHCl3 and
EtOAc partitions from G. xanthochymus fruits were analyzed
for their cytotoxic and DPPH activities. Both partitions
displayed activity in the DPPH assay (IC50 ) 32 and
105 íg/mL, respectively) and cytotoxicity against the SW-
480 colon cancer cell line (IC50 ) 15 and 50 íg/mL,
respectively) and were selected for further analysis. In the
present paper we describe the activity-guided isolation of
guttiferone H