The molecule is the intermediate in the biosynthesis of vitamin B12 from uroporphyrinogen III in which three methyl groups have been introduced at positions 2, 7 and 20 of the tetrapyrrole framework. It is a conjugate acid of a precorrin-3A(7-).
3-[(1Z,2S,3S,4Z,7S,8S,9Z)-7,13,17-tris(2-carboxyethyl)-3,8,12,18-tetrakis(carboxymethyl)-3,8,10-trimethyl-2,7,15,21,23,24-hexahydroporphyrin-2-yl]propanoic acid