CC(=O)N1CCN(C2CCC(n3nc(-c4ccc(NC(=O)c5cc6ccccc6n5C)cc4)c4c(N)ncnc43)CC2)CC1
Hydrogen bond acceptor: The atom, ion, or molecule component of a hydrogen bond which does not supply the bridging (shared) hydrogen atom. How many hydrogen bond acceptors does the molecule have?