There are two heme insertion isomers.
Shifts are provided for the holoprotein with heme oriented
as in Synechocystis sp. PCC 6803.GlbN (PDB ID 1MWB).

3-[(5Z,10Z,14Z,19Z)-18-(2-carboxyethyl)-8,13-bis(ethenyl)-3,7,12,17-tetramethyl-21,23-dihydroporphyrin-2-yl]propanoic acid

Architectural digest: Thermodynamic stability and domain structure of a consensus monomeric globin.

Backbone chemical shift of a consensus hemoglobin in the cyanomet state