Fig. 7From: Antinociceptive activity of petroleum ether fraction obtained from methanolic extract of Clinacanthus nutans leaves involves the activation of opioid receptors and NO-mediated/cGMP-independent pathwayComparison of chromatogram between PECN and several phenolic compounds at the wavelength of 254 nm demonstrated one peak that was believed to represent (Peak 4) cinnamic acid. Only chromatogram of cinnamic acid was presented for comparison purposesBack to article page