Cc1c(C#N)c(=O)[nH]c(=O)n1CCN1CCN(C(=O)NCCCCCCNC(=O)N2CCN(CCn3c(C)c(C#N)c(=O)[nH]c3=O)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?