CCOC(=O)NC(=O)c1cn(-c2ccc(CCOC(=O)CCCCCCCCC(=O)OCCc3ccc(-n4cc(C(=O)NC(=O)OCC)c(=O)[nH]c4=O)cc3)cc2)c(=O)[nH]c1=O
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?