CC(C)(C)OC(=O)NCc1ccc(CNC(=O)c2nc[nH]c2C(=O)NCc2ccc(CNC(=O)OC(C)(C)C)cc2)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?