tyl, cyclopentyl as well as cyclohexyl group, an aralkyl group with 7 to 18 carbon atoms, in particular the benzyl and phenethyl group, an alkylaryl group with 7 to 18 carbon atoms, in particular the tolyl group, as well as a heterocyclic group with 2 to 5 carbon atoms, in particular those in whose heterocyclic ring are at least one oxygen, sulfur or N atom, such as in particular the radicals of o