N#Cc1c(N2C(=O)[C@@H]3C(CC(N)=O)NC4(C(=O)Nc5ccc(Cl)cc54)[C@@H]3C2=O)sc2c1CCCC2
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?