3,6,9,12,15-Pentaoxaheptadecane-1,17-diyl Bis-amine is a polyether compound with amine groups on both termini. This oligoether is potentially useful as a hydrophilic spacer and cross-linking agent between molecules and in the design of hydrophilic tethers for linking molecules to substrates.A cross-linker. 3,6,9,12,15-Pentaoxaheptadecane-1,17-diyl Bis-amine is a polyether compound with amine groups on both termini. This oligoether is potentially useful as a hydrophilic spacer and cross-linking agent between molecules and in the design of hydrophilic tethers for linking molecules to substrates. A cross-linker.