CC(=O)c1ccc(N2C(=O)[C@H]3NN=C(C(=O)CCN4C(=O)c5ccccc5C4=O)[C@H]3C2=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?