everyone, get out your BiBLEs. by which I mean your Bi-Brachial Lariat Ethers.
(a cyclic polyether, with optional aza and thia substitutions, is called a crown ether. they're excellent and selective ligands for metal cations and small molecules. add a functionalized side-arm and you have a lariat ether. add two side-arms, as with the 1,10-diaza-18-crown-6 derivative in the lower right, and that's a bi-brachial lariat ether)
"Tribracchial lariat ethers, ‘TriBLEs,’ based on 4,10,16-triaza-18-crown-6: an apparent limit to sidearm contributions in lariat ether molecules" (J. Chem. Soc. Chem. Commun. , 1989, 608-610)
Bibles, Tribles, Tetrables, the possibilities are endless