| The two nitrogens are located next to one another on the ring. |
| These man-made compounds have a ring of six carbons joined to a 7-member ring with 5 carbons and 2 nitrogens indicated by diazo. |
| As a result, the deaminated product, urocanate, is not the usual a-keto acid associated with loss of a-amino nitrogens. |
| The free-base form of such porphyrins contains two pyrrole nitrogens. |
| A slight tweak brought the chemical's two nitrogens closer together and the altered version, called Diquat, is much less attractive to lung cells. |
