Having three carbon and three nitrogen atoms in a six-membered ring. From Wordnet, Princeton University.
The rigid linear molecules used contain aromatic six-membered rings as well as carbon–carbon triple bonds. From Wordnik.com. [Molecules Shaped Like Wagon Wheels | Impact Lab] Reference
Professor Hassel's elegant work on six-membered rings, carried out with ever increasing precision, has laid a solid foundation for a dynamic chemistry in three dimensions. From Wordnik.com. [Nobel Prize in Chemistry 1969 - Presentation Speech] Reference
Oslo dealt with inorganic chemistry, but from 1930 onwards his work was concentrated on problems connected with molecular structure, particularly the structure of cyclohexane and its derivatives and other substances containing six-membered rings related to that of cyclohexane. From Wordnik.com. [Odd Hassel - Biography] Reference
Pyridine is a six-membered ring with five carbon atoms and one nitrogen atom. From Wordnik.com. [PhysOrg.com - latest science and technology news stories] Reference
Penicillins are very similar, although they contain a five-membered ring in place of the six-membered ring present in the cephalosporin. From Wordnik.com. [Citizendium, the Citizens' Compendium - Recent changes [en]] Reference
Quinones are six-membered carbon rings with two oxygen atoms bound by double bonds to opposite ends of the molecule, and they occur in some microorganisms. From Wordnik.com. [PhysOrg.com - latest science and technology news stories] Reference
Adenine and guanine are fused five - and six-membered purines, while cytosine and thymine are six-membered rings called uracil (U), replaces thymine in RNA. From Wordnik.com. [Citizendium, the Citizens' Compendium - Recent changes [en]] Reference
A six-membered team from Harvard and MIT recently won both Harvard Business School's and MIT's business plan competitions for their non-profit enterprise Diagnostics-For-All, which aims to improve global health care by using the paper technology as affordable yet accurate diagnostic devices. From Wordnik.com. [The Harvard Crimson :: News] Reference
(25-30\%), and lignin (15-30\%) ... all of which are five - and six-membered cyclic oxygenates. From Wordnik.com. [Green Car Congress] Reference
Here it is easy to see the chemical structure, a four-membered ß-lactam ring attached to a six-membered sulphur-containing ring -- derived most probably like the corresponding penicillin, from "� - (a-aminoadipoyl) - cysteinyl valine but in an oxidized form. From Wordnik.com. [Nobel Lecture The X-Ray Analysis Of Complicated Molecules] Reference
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