| http://www.w3.org/ns/prov#value | - (D) acylating a compound of formula (I) wherein R is --OH or respectively --SH, with a reagent carrying a --COR6 moiety, wherein R6 is as defined above, so obtaining a compound of formula (I) wherein R is a group --OR5 or, respectively, a group --SR7 wherein R5 and, respectively, R7 are a group --COR6 wherein R6 is as defined above, or
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