COC1(OC)C[C@H](C)[C@@]23O[C@]24c2cc(O)c5c(c2N[C@H]3C#C/C=C\C#C[C@]14O)C(=O)c1ccccc1C5=O
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?