Fig. 4
From: Amide nitrogen pyramidalization changes lactam amide spinning

DFT-optimized structures of 16(C8)-19(C11). a DFT-optimized trans-isomers of 16(C8)-19(C11). b DFT-optimized cis-isomers of 16(C8)-19(C11). The distance between the ether oxygen atoms in the linker is shown in blue. Brown/gray: carbon atom; blue: nitrogen atom; red: oxygen atom. All hydrogen atoms are omitted for clarity