Patent ID: 7390890

Claim:
A pharmaceutically acceptable salt of a compound having the formula: wherein A is CH or N; B is chosen from OH, NH 2 , NHR, H or halogen; D is chosen from OH, NH 2 , NHR, H, halogen or SCH 3 ; R is an alkyl, aralkyl or aryl group; and X and Y are independently selected from H, OH or halogen except that when one of X and Y is hydroxy or halogen, the other is hydrogen; and Z is OH or, when X is hydroxy, Z is selected from hydrogen, halogen, hydroxy, SQ or OQ where Q is an alkyl, aralkyl or aryl group; or a tautomer thereof; and wherein the salt is derived from an acid selected from the group consisting of hydrochloric acid, sulfuric acid, phosphoric acid, acetic acid, lactic acid, fumaric acid, succinic acid, tartaric acid, gluconic acid, citric acid, methanesulphonic acid and p-toluenesulphonic acid.