SMILES: C[C@@]\\1([C@@H](C2=N/C1=C\\C3=C(C(=C(N3)CC4=C(C(=C(N4)CC5=C(C(=C(C2)N5)CC(=O)O)CCC(=O)O)CC(=O)O)CCC(=O)O)CCC(=O)O)CC(=O)O)CCC(=O)O)CC(=O)O
Description: The molecule is the first intermediate in the biosynthesis of vitamin B12 from uroporphyrinogen III, in which one methyl group has been introduced at position 2 of the tetrapyrrole framework. It is a conjugate acid of a precorrin-1(8-).