Cc1cc(O)c2c(c1)C(O)(c1ccc3c(c1O)C(=O)c1c(O)cc(C)cc1C3(O)C1OC(CO)C(O)C(O)C1O)c1cccc(O)c1C2=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?