CC(C)C[C@H]1CN([C@@H](Cc2ccc(O)cc2)CN2CCC[C@@H]2CN2C(=S)NC[C@@H]2Cc2ccccc2)C(=S)N1CC1CCCCCC1
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?