| 摘要 |
The invention relates to substantially pure compounds of the formula (1): and to pharmaceutically acceptable salts, prodrugs and solvates thereof, wherein R1, R2, R3, R5, and X are as defined herein, and wherein the compound of formula (1) optionally further comprises a hydroxy substituent, an O- glucuronic acid, or an N->O (N-oxide) moiety. The invention also relates to methods of treating abnormal cell growth in mammals by administering the compounds of formula (1) and to pharmaceutical compositions for treating such disorders that contain the compounds of formula (1). The invention also relates to methods of preparing the compounds of formula (1).
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