| http://www.w3.org/ns/prov#value | - carboxylic acid ester (10) is reacted to form N- substituted carbamate (3): (10) (3) [0064] The reaction may for example in some embodiments be represented as follows: (10) (3) or in some embodiments as follows: (10) (3) Generally, in this reaction protecting group R 5 of carboxylic acid ester (10) is replaced by an N-substituted carbamoyl group.
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