CC1(C)O[C@@H](CP(c2ccc3ccccc3c2)c2ccc3ccccc3c2)[C@H](CP(c2ccc3ccccc3c2)c2ccc3ccccc3c2)O1
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. How many hydrogen bond acceptors does the molecule contain?