Patent ID: 8802881

Claim:
A compound having a structural and stereochemical formula selected from the group consisting of: wherein: A is hydroxy, alkoxy, aryloxy, amino, alkylamino, dialkylamino or OM, wherein M is an ammonium, tetra-alkyl ammonium, sodium, potassium, magnesium or zinc cation; W is hydrogen, alkyl, alkenyl, alkynyl, aryl, heteroaryl, halo, hydroxy, alkoxy, aryloxy, carboxy, amino, alkylamino, dialkylamino, acylamino, carboxamido, or sulfonamide; R a -R c are each independently hydrogen, alkyl, aryl, acyl or alkoxyacyl; n is zero, one or two; and m is one or two, or a pharmaceutically acceptable salt thereof.