Patent ID: 6872850

Claim:
A compound having one of the following formulas: or a derivative or salt thereof, wherein R 1 and R 6 are independently selected from the group consisting of an alkyl and an aryl group; R 2 and R 5 are independently selected from the group consisting of hydrogen, an alkyl, and an aryl group; R 3 and R 4 are independently selected from the group consisting of hydrogen and an alkyl group; X is oxygen or H 2 N(HN)C(H)NN—; and m is at least one; or a derivative or salt or salt thereof, wherein R 1 and R 6 are independently selected from the group consisting of an alkyl and an aryl group; R 2 and R 5 are independently selected from the group consisting of hydrogen, an alkyl, and an aryl group; R 3 and R 4 are independently selected from the group consisting of hydrogen and an alkyl; and m is at least one; or a derivative or salt or salt thereof, wherein R 1 and R 5 are independently selected from the group consisting an aryl and an alkyl group; R 2 is hydrogen, an alkyl, or aryl group; R 3 and R 4 are independently selected from the group consisting of hydrogen and an alkyl group; X is oxygen or H 2 N(HN)C(H)NN—; and m is at least one; or a derivative or salt or salt thereof, wherein R 1 and R 6 are independently selected from the group consisting of an alkyl and an aryl group; R 3 is hydrogen, an alkyl, or an aryl group; R 2 , R 4 , and R 5 are independently selected from the group consisting of hydrogen and an alkyl; and m is at least one.