https://doi.org/10.1351/goldbook.C01350
Derivatives of the corrin
groups and one direct carbon–carbon bond linking α positions. ![Not defined](/img/inline/C01350-2.png)
nucleus
, which contains four reduced or partly reduced pyrrole rings joined in a macrocycle
by three ![Not defined](/img/inline/C01350-1.png)
![Not defined](/img/inline/C01350-2.png)