A Study on the Inhibition of DiHydroFolateReductase (DHFR) from Escherichia coli by Gold(I) Phosphane Compounds. Computational Studies and X-ray Crystal Structures of (4,5-dichloro-1H-imidazolate-1-yl)-triphenylphosphane-gold(I) and (4,5-dicyano-1H-imidazolate-1-yl)-triphenylphosphane-gold(I).