Compounds and their uses

or a pharmaceutically acceptable salt, solvate, hydrate, polymorph, prodrug, codrug, cocrystal, tautomer, racemate, stereoisomer or mixture thereof, in which: X is independently NO2 or H; and Y is selected from H, amino, amide, ester, carboxy and its esters and amides, alkyl, alkenyl, alkynyl, cycloalkyl, alkaryl, aryl, heterocyclic or heteroaryl groups, all of which can be substituted with heteroatoms and/or side groups, and wherein any chains can be straight or branched is disclosed.