CC1=CC(=O)/C(=C(/C)NCCN(CCN/C(C)=C2\C(=O)C=C(C)OC2=O)CCN/C(C)=C2\C(=O)C=C(C)OC2=O)C(=O)O1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?