A study on the inhibition of dihydrofolate reductase (DHFR) from Escherichia coli by gold(i) phosphane compounds. 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)1. Issue 7 (21st February 2015)