corrinoids (cobalamines, corphyrins, corrins, vitamin B12 compounds)
Derivatives of the corrin @N04256@, which contains four reduced or partly reduced pyrrole rings joined in a @M03662@ by three C01350-1.png groups and one direct carbon–carbon bond linking α positions.
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1328 [Terms] [Paper]
See also:
White Book, 2nd ed., p. 272 [Terms] [Book]