Nc1ncnc2c1ncn2[C@@H]1O[C@@H](COP(=O)(O)OP(=O)(O)OP(=O)(O)OP(=O)(O)OC[C@@H]2O[C@@H](n3cnc4c(N)ncnc43)[C@@H](O)[C@H]2O)[C@H](O)[C@@H]1O
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?