CCCCCCCCCCCCNC(=O)CCC(NC(=O)c1ccc(N(C)Cc2cnc3nc(N)nc(N)c3n2)cc1)C(=O)NCCCCCCCCCCCC
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?