C#CCN(C[C@H]1[C@H](OC(=O)NCCCCCC)[C@H](OC(=O)NCCCCCC)C[C@@H](C(=O)OC)[C@H]1C(=O)OC)S(=O)(=O)c1ccc(C)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?