The molecule is a nickel tetrapyrrole found only in methanogenic Archaea. It is the prosthetic group of the enzyme methyl coenzyme M reductase which catalyses the release of methane in the final step of methanogenesis. It has a role as a prosthetic group and a cofactor. It is a conjugate acid of a coenzyme F430(5-).
3-[(1R,3S,4S,5S,8R,11S,15E,17S,18S,19Z,22S,23S,29S)-5-(2-amino-2-oxoethyl)-4,22-bis(2-carboxyethyl)-18,29-bis(carboxymethyl)-5,23-dimethyl-14,25-dioxo-9,26,27,30-tetraza-28-azanidaheptacyclo[19.5.1.13,6.18,11.116,19.01,23.010,15]triaconta-6(30),9,15,19,21(27)-pentaen-17-yl]propanoic acid;nickel