C/C(CCC(=O)OC[C@@H]1O[C@H](C#Cc2ccccc2)C=C[C@@H]1Oc1ccc(C)cc1)=N/OC[C@@H](C)[C@H](OCc1ccccc1)C(C)C
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?