N#CCCN(CCCN(C(=O)Nc1ccc(NC(=O)N(CCCN(CCC#N)C(N)=O)c2ccccc2)cc1)c1ccccc1)C(N)=O
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?