five-membered

The dark blue copper ion is bonded in a cavity between two imidazole groups (the five-membered rings) and two yellow sulphur atoms.

The Nobel Prize in Chemistry 1992 1992

Some chemists were convinced the structure contained two five-membered rings connected by a single bond, known as a thiazolidine-oxazolone.

The Nobel Prize in Chemistry 1964 - Perspectives 1964

Others were equally sure it was a four-membered ring fused to a five-membered ring, known as a beta lactam.

The Nobel Prize in Chemistry 1964 - Perspectives 1964

The natural antibiotic, cephalosporin C, loses on hydrolysis an acetyl group to give the more stable Cc molecule with the carboxyl group combined in a five-membered lactone ring.

Nobel Lecture The X-Ray Analysis Of Complicated Molecules 1964

Of the 20 naturally occuring amino acids, proline is the only one that has a cyclic side chain, forming a five-membered ring that includes the backbone nitrogen.

WN.com - Articles related to 3D TVs new battleground for plasma, LCD display makers 2010

Of the 20 naturally occuring amino acids, proline is the only one that has a cyclic side chain, forming a five-membered ring that includes the backbone nitrogen.

WN.com - Articles related to 3D TVs new battleground for plasma, LCD display makers 2010

Of the 20 naturally occuring amino acids, proline is the only one that has a cyclic side chain, forming a five-membered ring that includes the backbone nitrogen.

WN.com - Articles related to 3D TVs new battleground for plasma, LCD display makers 2010

Of the 20 naturally occuring amino acids, proline is the only one that has a cyclic side chain, forming a five-membered ring that includes the backbone nitrogen.

WN.com - Articles related to 3D TVs new battleground for plasma, LCD display makers 2010

Of the 20 naturally occuring amino acids, proline is the only one that has a cyclic side chain, forming a five-membered ring that includes the backbone nitrogen.

WN.com - Articles related to 3D TVs new battleground for plasma, LCD display makers 2010

Of the 20 naturally occuring amino acids, proline is the only one that has a cyclic side chain, forming a five-membered ring that includes the backbone nitrogen.

WN.com - Articles related to 3D TVs new battleground for plasma, LCD display makers 2010