| http://www.w3.org/ns/prov#value | - m bound to a protecting group, or a disubstituted amine group, with the proviso that: if x is 1, R3 is H and R4 is a negatively charged oxygen atom, or R3 is an oxygen atom and R4 is an oxygen atom bound to a protecting group and R4 is either H or a disubstituted amine group.
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