COC(=O)C[C@H]1c2ccccc2C2=C(C[C@@H](C)[C@H]3C(=O)N(c4ccccc4)C(=O)[C@@H]23)N1C(=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?