COC(=O)CCCC1=CC2=C(c3ccccc3)C(=O)C(C)(OC(=O)C3CCCC3)C(=O)C2=CN1CCc1c[nH]c2ccccc12
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?