COc1ccc(OC(=O)N(C)C[C@H]2OCc3cnnn3CCCC(=O)N([C@@H](C)CO)C[C@H]2C)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?