`H_2N-HcdotsNH_3gtHO-HcdotsOH_2gtF-HcdotsF-H``H_2N-HcdotsNH_3ltHO-HcdotsOH_2ltF-HcdotsF-H``H_2N-HcdotsNH_3gtF-HcdotsF-HgtHO-HcdotsOH_2``H_2N-HcdotsNH_3ltHO-HcdotsOH_2gtF-HcdotsF-H`
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