Granted Patent B2

US 7,897,763 · App. 12/257,558 · Granted Mar 1, 2011

Abstract

Claims (7)

1. A compound of the formula:

or a salt thereof, wherein:

P 1 is R 1 , aryl-alkyl, heteroaryl-alkyl, or —C(O)R 13 ;

P 2 is aryl-alkyl, heteroaryl-alkyl, or —C(O)R 13 ;

R 1 is hydrogen or optionally substituted alkyl, alkyl-aryl, alkyl-heterocycle, aryl, or heterocycle; and

each R 13 is independently alkyl, aryl-alkyl, aryl, heterocycle, alkoxy, aryloxy, or aryl-alkoxy.

2. The compound of claim 1 , which is of the formula:

Assignments (10)