Patent ID: 6960594

Claim:
A compound of the formula: wherein X is selected from the group consisting of O and S; wherein A 1 and A 2 are individually selected from the group consisting of O, S and NH; wherein G 1 , and G 3 are C 1-4 alkyl chains; wherein G 5 is a C 0-4 alkyl chain; and wherein G 2 is H or wherein A 3 is O or NH and A 4 is NH 2; wherein G 4 is a C 5-8 aryl, a C 5-8 arylsulfonylamino, an C 5-8 arylamino; and wherein G 6 and G 7 are individually selected from the group consisting of H, F, Cl, I, Br and a C 1-4 alkyl, or a salt, ester, or salt of an ester thereof.