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2D structures and 3D optimized molecular geometries of natural products, viz. (a,b) Echinacoside, (c,d) Quercetagetin 7-glucoside, (e,f) Levan N, (g,h) Inulin from chicory, (i,j) 1,3-Dicaffeoylquinic acid, and (k,l) 6-(ethylamino) pyridine-3-carbonitrile as reference compound, were calculated using DFT/B3LYP/6-31G(d,p) level.
