C/C=C1/CN2CC[C@@H]3c4ccccc4N4[C@H](C(=O)OC)[C@H]1C[C@H]2[C@]34/C=C/C1=COC[C@H]2[C@@H]3Cc4c(n(C)c5ccccc45)[C@H](C[C@@H]12)N3C
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?