Patent ID: 8143447

Claim:
An isolated compound of the structural Formula (IIa): wherein at least one of R 1 , R 2 , R 3 , R 4 , and R 5 substituents is always a sulfur-containing substituent and where R 1 , R 2 , R 3 , R 4 , and R 5 are independently selected from the group consisting of hydrogen, hydroxy, amino, nitro, iodo, bromo, fluoro, (C 1 -C 6 ) alkyl, (C 1 -C 6 ) alkoxy, (C 3 -C 7 ) cycloalkyl, and phenyl, wherein at least two of the five R 1 , R 2 , R 3 , R 4 , and R 5 substituents are always hydrogen, and wherein the sulfur-containing substituent is selected from the group consisting of: or a pharmaceutically acceptable salt thereof.