Cucurbit[n]uril analogues.

  title={Cucurbit[n]uril analogues.},
  author={Jason Lagona and James C Fettinger and Lyle Isaacs},
  journal={Organic letters},
  volume={5 20},
[structure: see text] Cucurbits come in a variety of sizes, shapes, and colors. We present a building block approach that allows the tailor-made synthesis of CB[5], CB[6], and CB[7] analogues whose sizes, shapes, and colors differ from those of the known CB[n].