CC1OC(CC(=O)O)Cc2c(O)c3c(c(O)c21)C(=O)C=C(C1=CC(=O)c2c(O)c4c(c(O)c2C1=O)CC(CC(=O)O)OC4C)C3=O
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. This compound should contain a more electronegative atom (more electronegative than hydrogen) with lone electron pairs. Then it can attract protons from a donor. Moreover, the electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?