COc1cc(/C=C2\N=C(c3ccccc3)N(c3ccc(C(=O)c4ccccc4)cc3N3C(=O)/C(=C/c4cc(OC)c(OC)c(OC)c4)N=C3c3ccccc3)C2=O)cc(OC)c1OC
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?