Cc1c(Cl)cccc1NC(=O)Cn1c(=O)n(Cc2nc(-c3ccccc3)no2)c(=O)c2cc3c(cc21)OCO3
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?