2,and R2 is a group selected from hydrogen, substituted or unsubstituted (C1-C6)alkyl, aryl, heteroaryl, or heterocycloalkyl group; The structure A-NO2 is a structural formula (VI1 VII, VIII or IX): wherein Y is a bond which is bonded to linkage group "L", defined as above; and Z is a carbon (-CR7R8-), carbonyl (-C(O)-), amide (-C(O)N-), sulfonamide (-S(O2)N-), or a heteroatom selected from N, O, S, SO or SO2; wherein R5, R6, R7, and R8 are independently a group selected from hydrogen, substituted or unsubstituted (C1-C6)alkyl, aryl. heteroaryl. or heterocycloalkyl group; R5 and R6 R7 and R8 can join together to form a five to seven-member ring system optionally containing one to three heteroatoms.">
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