Nc1ccn(C2CCC(COP(=O)(O)OCC(O)COP(=O)(O)OCC3OC(n4cc(F)c(=O)[nH]c4=O)CC3O)O2)c(=O)n1
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?