| http://www.w3.org/ns/prov#value | - Preferred compounds corresponding to formula (VII) are those in which R20 is a methylene group, a 1,2-ethylene group, a 1,3-propylene group, a 2-hydroxy- or -nitro-substituted 1,3-propylene group, a 1,2-cycloalkylene group containing 4 to 6 carbon atoms, more especially a 1,2-cyclohexylene group, or an o-phenylene group.
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