prov:value
| - Particularly preferably, B is a moiety selected from the group consisting of: --CO2 R1, --CONR1 R2, --NR1 COR2, --NR1 CONR1 R2, --S(O)n NR1 R2, --NR1 S(O)n R2, --NR1 S(O)n NR1 R2, --P(O)R1 R2, and --P(O)(OR1)(OR2), wherein all substituents are as defined above.
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