CCCCCCCCCCCCCCCCCCNc1ccn(C2OC(COP(=O)(O)OCC3OC(n4cc(C)c(=O)[nH]c4=O)CC3O)C(O)C2O)c(=O)n1
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?