| http://www.w3.org/ns/prov#value | - Intermediates denoted * in which R2 is R21R22CH (R21 and R22 are independently defined in the same manner as R2) may be prepared from the corresponding intermediates denoted * in which R2 is hydrogen by reductive amination with a ketone or aldehyde R21R22CO and a reducing agent, such as sodium cyanoborohydride in the presence of an acid, such as acetic acid.
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