Cholestane

Cholestane
	; IUPAC numbering
Names
	IUPAC name Cholestane
	Systematic IUPAC name (1R,3aS,3bR,9aS,9bS,11aR)-9a,11a-Dimethyl-1-[(2R)-6-methylheptan-2-yl]hexadecahydro-1H-cyclopenta[a]phenanthrene
Identifiers
CAS Number	14982-53-7 5α/β ; 481-21-0 5α ; 481-20-9 5β ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:35516 ;
ChemSpider	5256870 ;
ECHA InfoCard	100.035.496
IUPHAR/BPS	2802;
PubChem CID	6857534;
UNII	U260HWN305 (5α) ;
CompTox Dashboard (EPA)	DTXSID20880725 ;
	InChI InChI=1S/C27H48/c1-19(2)9-8-10-20(3)23-14-15-24-22-13-12-21-11-6-7-17-26(21,4)25(22)16-18-27(23,24)5/h19-25H,6-18H2,1-5H3/t20-,21?,22+,23-,24+,25+,26+,27-/m1/s1 Key: XIIAYQZJNBULGD-LDHZKLTISA-N ; InChI=1/C27H48/c1-19(2)9-8-10-20(3)23-14-15-24-22-13-12-21-11-6-7-17-26(21,4)25(22)16-18-27(23,24)5/h19-25H,6-18H2,1-5H3/t20-,21?,22+,23-,24+,25+,26+,27-/m1/s1 Key: XIIAYQZJNBULGD-LDHZKLTIBN;
	SMILES C[C@H](CCCC(C)C)[C@H]1CC[C@@H]2[C@@]1(CC[C@H]3[C@H]2CCC4[C@@]3(CCCC4)C)C; C41CCCC[C@@]1([C@@H]3[C@H]([C@@H]2CC[C@@H]([C@@]2(C)CC3)[C@H](C)CCCC(C)C)CC4)C;
Properties
Chemical formula	C27H48
Molar mass	372.681 g·mol−1
Density	0.911 g/ml
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Cholestane is a saturated tetracyclic triterpene. This 27-carbon biomarker is produced by diagenesis of cholesterol and is one of the most abundant biomarkers in the rock record. Presence of cholestane, its derivatives and related chemical compounds in environmental samples is commonly interpreted as an indicator of animal life and/or traces of O₂, as animals are known for exclusively producing cholesterol, and thus has been used to draw evolutionary relationships between ancient organisms of unknown phylogenetic origin and modern metazoan taxa. Cholesterol is made in low abundance by other organisms (e.g., rhodophytes, land plants), but because these other organisms produce a variety of sterols it cannot be used as a conclusive indicator of any one taxon. It is often found in analysis of organic compounds in petroleum.

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