CCOC(=O)N1CCN(C(=O)c2cn(CC)c3ccc(S(=O)(=O)N4CC(C)CC(C)C4)cc3c2=O)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?