“…The phenylpropanoids (E)-cinnamaldehyde, cis-2-methoxycinnamic acid, and cinnamyl acetate were the main compounds identified in CC-EO. (E)-cinnamaldehyde is been considered a marker of cinnamon EOs, and its occurrence as the major compound in the EO from C. cassia bark has been commonly reported [25,26,28,[43][44][45][46][47][48][49][50][51][52][53], followed by (E)-o-methoxy-cinnamaldehyde [25,28,43,45,47,48,[50][51][52][53], and cinnamyl acetate [25,26,44,48,50,53]. On the other hand, the identification of (E)-cis-2-methoxycinnamic acid as a major compound in the EO from C. cassia bark is rare [54,55], whereas the presence of benzaldehyde with a relative area higher than 5% is uncommon.…”