https://www.ncbi.nlm.nih.gov/Structure/pdb/5KSJ
5KSJ: Crystal structure of deoxygenated hemoglobin in complex with Sphingosine phosphate
Hemoglobin subunit alphaHemoglobin subunit beta(2S,3R,4E)-2-amino-3-hydroxyoctadec-4-en-1-yl dihydrogen phosphatePROTOPORPHYRIN IX CONTAINING FE
crystal structuredeoxygenated hemoglobin