Cl.O=C(OCN1C(=O)C2C3C=CC(C2C1=O)C1C2C(=O)N(COC(=O)C4CCCN4)C(=O)C2C31)C1CCCN1
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?