C#CC1(O)CCC2[C@@H]3CCc4cc(Oc5nc(F)nc(-c6c(C)c(C(=O)OCC)n7ccccc67)n5)ccc4C3CC[C@@]21C
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. How many hydrogen bond acceptors does the molecule contain?