CC1=NNC(=S)NCCCN2CCN(CCCNC(=S)NN=C(C)C=NNC(=S)NCCCN3CCN(CCCNC(=S)NN=C1)CC3)CC2
Hydrogen bond acceptor: The atom, ion, or molecule component of a hydrogen bond which does not supply the bridging (shared) hydrogen atom. How many hydrogen bond acceptors does the molecule have?