CCNC(=S)/N=c1\sc(NCC)nc2sc3c(c12)CCN(N1CCc2c(sc4nc(NCC)s/c(=N\C(=S)NCC)c24)C1)C3
Hydrogen bond acceptor is the chemical compound which contains the lone electron pairs that participate in the hydrogen bond formation. This compound should contain a more electronegative atom (more electronegative than hydrogen) with lone electron pairs. Then it can attract protons from a donor. Moreover, the electronegative atoms usually involved in hydrogen bonding are oxygen, nitrogen and fluorine. How many hydrogen bond acceptors does the molecule contain?