C#CCCOC(=O)N1C2=NC(C(=O)OC)=C(C(=O)OC)[C@@H]3N(C)c4ccccc4[C@]23C[C@H]1C(=O)OC
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?