CCCC1(C(=O)OCC)NC(c2ccc(OC)cc2OC)C2C(=O)N(c3ccc4c(c3)OCCO4)C(=O)C21
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?