| http://www.w3.org/ns/prov#value | - Compound of formula XXI, where P is a protecting group, was synthesized by reacting compound 11 with an appropriate reagent to introduce a protecting group (e.g. tert-butyloxycarbonyl di anhydride) and a base (e.g. sodium hydride) in a solvent (e.g. THF) typically at room temperature for 12-18 hours.
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