Cc1ccccc1-n1c(=O)[nH]c(O)c(C(c2ccncc2)c2c(O)[nH]c(=O)n(-c3ccccc3C)c2=O)c1=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?