CC1(C)C(=O)C(O)=CC2C1=CCC1C2(C)C(=O)CC2(C)C(C(C)(O)C(=O)CC(O)C(C)(C)O)C(O)CC12C
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?