Patent ID: 6849743

Claim:
A compound of Formula III: or a salt thereof wherein: R 1 is alkyl, alkenyl, alkynyl, cycloalkyl, aryl, alkaryl, aralkyl, where the ring portion of any of said aryl, aralkyl, or alkaryl can be optionally substituted; R 2 is alkyl, cycloalkyl, aryl, alkaryl, aralkyl, alkoxy, hydroxy, alkoxyalkyl, or amido, where the ring portion of any of said aryl, aralkyl, or alkaryl can be optionally substituted; R 3 is alkyl, alkenyl, alkynyl, cycloalkyl, aryl, alkaryl, any of which can be optionally substituted; and R 5 and R 6 are independently one of alkyl or alkaryl; or R 5 and R 6 when taken together with the nitrogen atom to which they are attached form a 5- to 7-membered heterocyclic ring, which can be optionally substituted, and which can optionally include an additional oxygen or nitrogen atom.