CC(=O)NC1C(OCc2ccccc2)OC(CO)C(O)C1OCC(=O)NC(C)C(=O)NC(CCC(=O)OCCNC(=O)c1cccc2cc3ccccc3nc12)C(N)=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?