CC(OCc1ccccc1)C(NC(=O)OC(C)(C)C)C(=O)NC1COC2CC(n3ccc(=O)[nH]c3=O)OC12
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?