| 摘要 |
This invention provides compounds having excellent antitumor activity, which are represented by the following formula (see formula I-2) in which R2 stands for a residual group remaining after removing all carboxyl groups present in a carboxylic acid; m is 1, 2 or 3; n is 0, 1 or 2 and m + n is the number of carboxyl groups which are present in the carboxylic acid.
|
