Chartreusin derivatives, salts thereof, antitumorous compositions containing the same, and processes for producing the same

摘要

This invention relates to a novel chartreusin derivative of the general formula (I): IMAGE (I) and a salt thereof. This chartreusin derivative and a salt thereof have an excellent antitumor activity, which is exhibited even when the site of cancer inoculation and the site of drug administration are different. This invention further relates to a antitumorous composition containing the above-mentioned compound as active ingredient. This invention furthermore relates to a process for producing the above-mentioned chartreusin derivative or salt thereof.