COC(=O)N1C2CC(=O)O[C@@H]3c4cc5c(cc4[C@]1(C)[C@@]3(Br)c1ccccc12)OCO5
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?