| http://www.w3.org/ns/prov#value | - A composition comprising a plurality of beads wherein each of said beads further comprises a linker having the formula ##STR32## wherein, 1 is methyl;R3 is methoxy; R2 and R4 are hydrogen X21 is --OH, --NH2, --OP, and --NHP, wherein P is a suitable protecting group; and q is 1 or 3. 8.
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