C[C@]12C=CC(=O)C=C1CC[C@@H]1C2=CC[C@]2(C)[C@@H](C(=O)CN3CCN(c4cc(N5CCCC5)nc(N5CCCC5)n4)CC3)CC[C@@H]12.O=C(O)/C=C\C(=O)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?