COC(=O)c1ccc(Cn2nnc3c(O)nc(C4CCCN(S(=O)(=O)c5ccccc5Cl)C4)nc32)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?