A compound having the structure: wherein L 3 is a linker group, which is a member selected from a bond, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl and substituted or unsubstituted heterocycloalkyl; wherein L 3 is substituted with at least one functional moiety, wherein said functional moiety has the structure: wherein L 6 is a linker group, which is a member selected from substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl and substituted or unsubstituted heteroaryl; and X 1 is a member selected from a reactive functional group and a targeting moiety wherein the reactive functional group is selected from a group consisting of amines, hydrazines, hydrazides, sulfonylhydrazides, N-hydroxysuccinimide esters, sulfur-NHS esters, imidoesters, isocyantaes, isothiocyanates, arylhalides, acylhazides, p-nitrophenyl esters, aldehydes, ketones, sulfonyl chlorides, thiazolides, carboxyl, hydroxyl, sulfhydryl, haloalkyl, alkenes, epoxides, phosphoramidites, maleimides, alkyl halides, acyl halides (including bromoacetamide and chloroacetamide), pyridyl disulfides, thiophthalimides, hydroxybenztriazole esters, acid halides, acyl imidazoles, thioesters, esters; and wherein the targeting moiety is selected from the group consisting of a small-molecule ligand, a peptide, a protein, a fusion protein, an enzyme, an antibody, an antibody fragment, an antigen, a nucleic acid, a carbohydrate, a lipid, a toxin, a pharmaceutical drug and a drug of abuse; wherein the term "alkyl" by itself or as a part of another substituent means a straight or branched chain or cyclic hydrocarbon radical, or combination thereof which may be fully saturated, mono- or polyunsaturated and can include di- and multivalent radicals having the number of carbon atoms designated. L 6 is a linker group, which is a member selected from substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl and substituted or unsubstituted heteroaryl; and X 1 is a member selected from a reactive functional group and a targeting moiety wherein the reactive functional group is selected from a group consisting of amines, hydrazines, hydrazides, sulfonylhydrazides, N-hydroxysuccinimide esters, sulfur-NHS esters, imidoesters, isocyantaes, isothiocyanates, arylhalides, acylhazides, p-nitrophenyl esters, aldehydes, ketones, sulfonyl chlorides, thiazolides, carboxyl, hydroxyl, sulfhydryl, haloalkyl, alkenes, epoxides, phosphoramidites, maleimides, alkyl halides, acyl halides (including bromoacetamide and chloroacetamide), pyridyl disulfides, thiophthalimides, hydroxybenztriazole esters, acid halides, acyl imidazoles, thioesters, esters; and wherein the targeting moiety is selected from the group consisting of a small-molecule ligand, a peptide, a protein, a fusion protein, an enzyme, an antibody, an antibody fragment, an antigen, a nucleic acid, a carbohydrate, a lipid, a toxin, a pharmaceutical drug and a drug of abuse; wherein the term "alkyl" by itself or as a part of another substituent means a straight or branched chain or cyclic hydrocarbon radical, or combination thereof which may be fully saturated, mono- or polyunsaturated and can include di- and multivalent radicals having the number of carbon atoms designated.