C#CCOCCOCCOCCNc1nc(N2CCN(C(=O)[C@H](CCCCN)n3cc(CCCC)nn3)CC2)nc(N2CCN(C(=O)[C@H](C(C)C)n3cc(CCO)nn3)CC2)n1.Cl
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?