CN(C)[C@@H](COC(C)(C)C)c1nnc([C@H](Cc2ccc(OC(C)(C)C)cc2)NC(=O)C2CCN(C(=O)OC(C)(C)C)CC2)o1
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?