CC(=O)O[C@H]1CC[C@@H](OC(C)=O)[C@H]2[C@H](O)[C@H](O)[C@@H]1n1c(=O)n(-c3ccccc3)c(=O)n12
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?