Pyridine Pyridazine Pyrimidine Pyrazine
/ \ / \ / \
/ \ N / \ N / \ N
| | | | | |
| | | | | |
N \ / N \ / N \ /
\ / \ / \ /
N N N
\________________________________/
Triazines
N N
/ \ / \
/ \ N N / \
| | | |
| | | |
\ / N \ / N
\ / \ /
N N
Encyclopaedia Britannica, 11th Edition, "Châtelet" to "Chicago" Volume 6, Slice 1 · 第 27 / 67 题