English: Structure generated with Jmol 14.30.2 using CIF data for Vitamin B12 hydrate exported from the Cambridge Structural Database (VITAMB, CCDC 1284686; https://www.ccdc.cam.ac.uk/structures/Search?Ccdcid=1284686&DatabaseToSearch=Published): C. Brink-Shoemaker, D.W.J. Cruickshank, D.C. Hodgkin, M.J. Kamper, D. Pilling, Proceedings of the Royal Society London, Series A, 1964, 278, 1, doi:10.1098/rspa.1964.0042 (bonds in "the Loop" below the corrin plane shown TRANSLUCENT)
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