| http://www.w3.org/ns/prov#value | - s an alkoxy radical containing 1 to 4 carbon atoms or a trihalomethyl radical or a phenyl radical substituted by a trihalomethyl radical and R4 is a hydrogen atom, or R3 and R4 form, together with the carbon atom to which they are attached, a 4- to 7-membered ring, and G1 is a hydrogen atom or an acetyl, alkoxyacetyl or alkyl radical or a hydroxy-protecting group. 2.
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