Cn1c(=O)c2c(nc(CN3CCN(C(=O)c4ccco4)CC3)n2CC(=O)C(C)(C)C)n(C)c1=O
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?