C#CCOCCOCCOCCNc1nc(N2CCN(C(=O)[C@H](C)n3cc(CCCN=C(N)N)nn3)CC2)nc(N2CCN(C(=O)[C@H](C)n3cc(CCCN=C(N)N)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?