N1,N1'-Dithiobis(ethane-2,1-diyl)bis(hexane-1,6-diamine) (II) is prepared starting from 6-aminohexylcyste amine (I) by potassium ferricyanide oxidation. The condensation of (II) with pyrrol 2-carboxaldehyde and subsequent reduction with NaHB4 of the resulting Schitf base gives (III), which is crvstallized as tetraoxatate.