The molecule is a cobalt-corrinoid heptacarboxylic acid with 8 methyl groups at positions 1, 2, 5, 7, 12, 15, 17; -CH2COOH groups at positions 2, 7, 18; -CH2CH2COOH groups at positions 3, 8, 13, 17; and divalent cobalt centred among the four nitrogens. It is a part of the vitamin B12 structure. It is a cobalt-corrinoid heptacarboxylic acid and a cobyrinic acid. It derives from a hydrogenobyrinic acid. It is a conjugate acid of a cob(II)yrinate(6-).
cobalt(2+);3-[(1R,2S,3S,5Z,7S,8S,10Z,13S,15Z,17R,18R,19R)-3,13,17-tris(2-carboxyethyl)-2,7,18-tris(carboxymethyl)-1,2,5,7,12,12,15,17-octamethyl-8,13,18,19-tetrahydro-3H-corrin-24-id-8-yl]propanoic acid