| http://www.w3.org/ns/prov#value | - The linkage may be attached to the moieties by any suitable bond or functional group, including carbon-carbon bonds, esters, ethers, amides, amines, carbonates, carbamates, sulfonamides, etc. [0129] In one exemplary embodiment, the crosslinking molecule comprises moieties that are biologically active drugs joined by a linkage that is biologically active and hydrolyzes under physiological condition
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