crown ethers having a side chain that holds one or more additional coordinating sites.
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1347 (https://doi.org/10.1351/pac199567081307)
PAC, 1988, 60, 461. 'Lariat ethers: from cation complexation to supramolecular assemblies' on page 461 (https://doi.org/10.1351/pac198860040461)