Copper( II ) complexes with anti-inflammatory drugs as ligands. Molecular and crystal structures of bis(dimethyl sulphoxide)tetrakis(6-methoxy-α-methyl-2-naphthaleneacetato)dicopper( II ) and bis(dimethyl sulphoxide)tetrakis[1-methyl-5-(p-toluoyl)-1H-pyrrole-2-acetato]dicopper( II )