| US 7,572,803 B2 | ||
| Hydrated crystalline esters of camptothecin | ||
| Zhisong Cao, Friendswood, Tex. (US) | ||
| Assigned to The Christus Stehlin Foundation for Cancer Research, Houston, Tex. (US) | ||
| Filed on Oct. 25, 2007, as Appl. No. 11/923,727. | ||
| Prior Publication US 2009/0111845 A1, Apr. 30, 2009 | ||
| Int. Cl. A61K 31/4745 (2006.01); C07D 491/22 (2006.01) | ||
| U.S. Cl. 514—283 [546/48] | 19 Claims |
1. A crystalline camptothecin hydrate of formula (I):
 |