C=CCN1c2ccccc2[C@]23C[C@@H](C(=O)OC)N(C(=O)c4ccc(Br)cc4)C2=NC(C(=O)OC)=C(C(=O)OC)[C@H]13
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?