Patent ID: 6989386

Claim:
An ammonium salt of the compound of formula II: wherein: R 2 represents up to four groups independently selected at each occurrence of R 2 from the group consisting of hydrogen, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 3-8 cycloalkyl, C 1-6 alkoxy, chloro, fluoro, hydroxy, and —COOH; R 3 , R 4 , and R 5 are each independently selected from hydrogen and C 1-6 alkyl; or NR 3 R 4 taken in combination can form a 5 to 7 member heterocycle having at least one nitrogen ring atom; and x is a real number greater than 0 and less than about 4.