C/C(CCC(=O)OC[C@@H]1O[C@H](C#Cc2ccccc2)C=C[C@@H]1Oc1ccc(C)cc1)=N/OC[C@@H](O)COCc1ccco1
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?