CC(C)=CCc1c(O)c(CC2=C(O)C(CC=C(C)C)(C(=O)C(C)C)C(O)=C(C)C2=O)c(O)c(C(=O)C(C)C)c1O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?