Antiproliferative activity of semisynthetic xylopic acid derivatives.

Two ent-kaurene diterpenoids, ent-15- β -acetyloxy-kaur-16-en-19-oic acid (xylopic acid) 1 and ent-7-oxo-kaur-16-en-19-oic acid 2 were isolated from the fruits of Xylopia aethiopica. Chemical manip...