C/C=C/C=C\C(=O)Nc1cccc(C2=NOC3(C2)C[C@H](C(N)=O)N(C(=O)CC#N)C3)c1
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?