Figure 5
From: Theoretical study on the glycosidic C–C bond cleavage of 3’’-oxo-puerarin
Rotational energy changes of puerarin (1) and 3’’-oxo-puerarin (2). Stable conformer of puerarin (A) and 3’’-oxo-puerarin (B). Both were stabilized by H-bonding interactions between glucopyranosyl oxygen and 7O–H. Four stable conformers were found from B-ring rotamers (C). For the glycosyl rotamers of 1 and 2, only one stable conformer was found for each ((D,E), respectively)). H-bonding interaction was emphasized by dashed line in (B).
