| http://www.w3.org/ns/prov#value | - nally protected by protective groups, M is a metal chosen from magnesium, copper and zinc and Hal is halogen such as bromine or chlorine, a substitution reaction of hydroxyl by a compound of formula Z'--Hal in which Hal is halogen and Z' has the above meanings, a conversion reaction of oxo (???O) into thioxo (???S), an esterification of an acid function, a saponification of an ester into an acid,
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