crown ethers having a side chain that holds one or more additional coordinating sites.
See: crown
Source:
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)
See also:
PAC, 1988, 60, 461. 'Lariat ethers: from cation complexation to supramolecular assemblies' on page 461 (https://doi.org/10.1351/pac198860040461)