SMILES: C/C/1=C/2\\[C@@]([C@@H](C(=N2)/C=C\\3/[C@@]([C@@H](/C(=C/C4=C(C(=C(N4)CC5=C(C(=C1N5)CC(=O)O)CCC(=O)O)CCC(=O)O)CC(=O)O)/N3)CCC(=O)O)(C)CC(=O)O)CCC(=O)O)(C)CC(=O)O
Description: 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-).