CC1NC(=O)C(N)CNC(=O)C(C2CCNC(=N)N2)NC(=O)/C(=C/NC(N)=O)NC(=O)C(CNC(=O)CC(N)CCCN)NC1=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?