prov:value
| - 8???, ???NR8CO???, ???CONR8???, ???NR8SO2???, ???SO2NR8???, ???NR8???NR8???, or ???CR9R10???, wherein R8 is a hydrogen atom, alkyl, cycloalkyl, aryl, aralkyl, or amino-protecting group, and R9 and R10 are the same or different and each is a hydrogen atom, alkyl, cycloalkyl, aryl, or aralkyl.
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