COc1ccc(O[C@H]2C=C[C@@H](c3ccccc3)O[C@@H]2COC(=O)CCC(C)=NO[C@@H]2O[C@H](COC(C)=O)[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]2OC(C)=O)cc1
Molecules possible for drug usually have no more than 5 Hydrogen bond acceptor. How many hydrogen bond acceptors does the molecule have?