| http://www.w3.org/ns/prov#value | - (a) deprotecting a compound of the formula wherein R1, R2, R3, R4, X and Y are as defined in claim 1 and either P1, P2 and P3, when taken separately, are protecting groups or, P1 and P2, when taken together are a protecting group and P3 is a protecting group, the protecting groups being removed together or sequentially; or (b) deprotecting a compound of the formula wherein R1, R2, R3, R4, X and Y
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