The main reasons for the superior antitumor activity of 7-Ethylcamptothecin compared with CPT are as follows: (a) 7-Ethylcamptothecin had a stronger growth-inhibiting activity against tumor cells, and (b) 7-Ethylcamptothecin remained in the intestinal tract for a longer time and in higher amounts when administered in vivo. 7-Ethyl Camptothecin is a natural compound found in the barks of Camptotheca acuminata Decne, it can be used as a cosmetics material.