CCCCC(=O)Nc1ccc2c(C)cc(-c3ccc(-c4cc(-c5ccc(C)cc5)cc(-c5ccc(-c6cc(C)c7ccc(NC(=O)CCCC)nc7n6)cc5)n4)cc3)nc2n1
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?