| http://www.w3.org/ns/prov#value | - Especially preferred are 1,6-naphthyridine derivatives of formula (I), in which R1 is an unsubstituted phenyl radical or a phenyl radical substituted in the 2-position by halogen or trifluoromethyl or is an unsubstituted 1-naphthyl radical, R2 is an isopropyl or 1-dimethylamino-2-propyl radical, R3 is a hydrogen atom, R4 is a methyl radical, an amino, cyano, formyl, hydroxyethoxymethyl, hydroxymet
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