| US 7,608,253 B2 | ||
| Hydrolytically degradable carbamate derivatives of poly (ethylene glycol) | ||
| Michael D. Bentley, Huntsville, Ala. (US); and Xuan Zhao, Dong Cheng District (China) | ||
| Assigned to Nektar Therapeutics, San Carlos, Calif. (US) | ||
| Filed on Apr. 28, 2006, as Appl. No. 11/414,456. | ||
| Application 09/842514 is a division of application No. 09/469418, filed on Dec. 23, 1999, granted, now 6,413,507. | ||
| Application 11/414456 is a continuation of application No. 11/033547, filed on Jan. 10, 2005, granted, now 7,060,259. | ||
| Application 11/033547 is a continuation of application No. 10/361451, filed on Feb. 10, 2003, granted, now 6,899,867. | ||
| Application 10/361451 is a continuation of application No. 09/842514, filed on Apr. 26, 2001, granted, now 6,541,015. | ||
| Prior Publication US 2006/0193823 A1, Aug. 31, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. A61K 31/70 (2006.01) | ||
| U.S. Cl. 424—78.08 [424/78.18; 424/78.31] | 5 Claims |
1. A compound having the formula:
 L is —O—or —NHCO—;
POLY is poly(ethylene glycol) having a capping group selected from the group consisting of —H, alkoxy, and
 |