4-DESOXY-EPIPODOPHYLLOTOXIN DERIVATIVE OR PHARMACEUTICALLY ACCEPTABLE SALT THEREOF

摘要

A 4-desoxy-4-epipodophyllotoxin derivative of the following formula (see above formula I) ¢wherein R and R1 are as defined in the specification! or a pharmaceutically acceptable salt thereof as well as an antitumor composition comprising such derivative or salt as an active ingredient.