| http://www.w3.org/ns/prov#value | - In accordance with another specific embodiment of the invention, in the abovementioned formulae (I) and (II), Y is a protecting group known to those skilled in the art, for instance those described in the books Protective Groups in Organic Synthesis", T. W. Greene, John Willey & Sons ed., NY, 1981, pp. 193-217; Protecting Groups", P. Kocienski, Thieme, 3rd edition, 2005, chap. 5.
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