Polyprenols, regular (head-to-tail) isoprenoid alcohols with 7–9 prenyl units, were tentatively identified in several cultivated cyanobacteria. Heptaprenol (C35), octaprenol (C40) and a suite of nonaprenols (C45) were present in unicellular and filamentous non-heterocystous cyanobacteria, while they were absent in heterocystous species. Structurally related components, e.g. long-chain (greater-or-equal, slantedC35) acyclic regular isoprenoid hydrocarbons, have been reported from petroleum and cyanobacterial polyprenols may be potential precursors.
Bauersachs, T., Schouten, S., Compaore, J., Stal, L. J., & Sinninghe Damsté, J. S. (2010). Occurrence of C35-C45 polyprenols in filamentous and unicellular cyanobacteria. Organic Geochemistry, 41(9), 867-870. https://doi.org/10.1016/j.orggeochem.2010.04.018