C#CCOCCOCCOCCNc1nc(N2CCN(C(=O)[C@H](CCC(=O)O)n3cc(CN)nn3)CC2)nc(N2CCN(C(=O)[C@H](CCC(=O)O)n3cc(CN)nn3)CC2)n1
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?