O=C(O)/C=C/C(=O)O.O=C(O)/C=C/C(=O)O.O=C(O)/C=C/C(=O)O.O=C1CCCN1CC#CCN1CCCC1.O=C1CCCN1CC#CCN1CCCC1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?