24-Norcholestane

24-Norcholestane
Names
IUPAC name
24-Nor-5ξ-cholestane
Systematic IUPAC name
(1R,3aS,3bR,5aΞ,9aS,9bS,11aR)-9a,11a-Dimethyl-1-[(2R)-5-methylhexan-2-yl]hexadecahydro-1H-cyclopenta[a]phenanthrene
Identifiers
3D model (JSmol)
  • InChI=1S/C26H46/c1-18(2)9-10-19(3)22-13-14-23-21-12-11-20-8-6-7-16-25(20,4)24(21)15-17-26(22,23)5/h18-24H,6-17H2,1-5H3/t19-,20?,21+,22-,23+,24+,25+,26-/m1/s1
  • Key: OSKAUJPRHJFGLQ-LBSJJPSCSA-N
  • C[C@H](CCC(C)C)[C@H]1CC[C@@H]2[C@@]1(CC[C@H]3[C@H]2CCC4[C@@]3(CCCC4)C)C
Properties
C26H46
Molar mass 358.654 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

24-Norcholestane, a steroid derivative, is used as a biomarker to constrain the source age of sediments and petroleum through the ratio between 24-norcholestane and 27-norcholestane (24-norcholestane ratio, NCR), especially when used with other age diagnostic biomarkers, like oleanane. While the origins of this compound are still unknown, it is thought that they are derived from diatoms due to their identification in diatom rich sediments and environments. In addition, it was found that 24-norcholestane levels increased in correlation with diatom evolution. Another possible source of 24-norcholestane is from dinoflagellates, albeit to a much lower extent.

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