COc1ccc(N2C3=C(C(=O)CC(C)(C)C3)C(c3cn(C)nc3C)C3=C2CC(C)(C)CC3=O)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?