Patent ID: 8232360

Claim:
A chemical compound having formula 1: wherein: Y 1 2 and Y 2 2 independently represent H 2 or R 2 2 ; R 1 represents —C(O)— or —CR 5 R 6 —; R 2 , R 3 , R 4 , R 5 , R 6 R 7 , and R 8 represent: H or a branched or unbranched, saturated, acyclic hydrocarbon group having a minimum of 1 and a maximum of 24 carbon atoms; a minimum of 1 and a maximum of 8 (CH 2 CH 2 O) n or (CH 2 CH 2 NH) n groups; a saturated carbocyclic or heterocyclic hydrocarbon ring having a minimum of 3 and a maximum of 24 carbon atoms; a fused or unfused carbocyclic aryl ring having a minimum of 6 and a maximum of 20 carbon atoms; or a fused or unfused heterocyclic aryl ring having a minimum of 5 and a maximum of 20 carbon or heteroatoms (O or N), and wherein each ring of R 2 , R 3 , R 4 , R 5 , R 6 R 7 , and R 8 is optionally substituted with one or more halo, nitro, hydroxyl, amino, C 1 -C 4 alkylamino or dialkylamino, C 1 -C 6 alkoxy, or a C 1 -C 4 alkyl group; x and y both equal 1 or x and y both equal 2; b represents 0 or 1; and Z represents OR 7 , SR 7 , NR 7 R 8 , or an active moiety.