Nc1ccc(Cc2ccc(/N=C\c3ccc(OCc4cccc(COc5ccc(/C=N\c6ccc(Cc7ccc(N)cc7)cc6)cc5)n4)cc3)cc2)cc1
The electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?