O=C(NCCNCC(O)COc1ccc(O)cc1)N1CCOCC1.O=C(NCCNCC(O)COc1ccc(O)cc1)N1CCOCC1.O=C(O)/C=C/C(=O)O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?