Turk J Chem 36 (2012) , 279 – 291. ... 400 MHz) and 13 C-NMR (100 MHz) spectra were recorded employing a Varian Mercury 400 MHz FT spectrometer (Varian Inc., Palo Alto, CA, USA), in DMSO-d6 at the Faculty of Pharmacy, Ankara University, Ankara, Turkey. ... Chemistry ...