CCOC(=O)C1CCN(C(=O)COC(=O)c2ccc3c(c2)C(=O)N(c2ccc(OCC)cc2)C3=O)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?