O=C1N2Cc3c4ccc5c3CN3C(=O)N6Cc7c(ccc(c7CN1C6(c1ccccc1)C23c1ccccc1)OCCOCCNCCOCCO4)OCCOCCNCCOCCO5
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?