Zymosterol is an intermediate in cholesterol biosynthesis. Disregarding some intermediate compounds (e.g. 4-4-dimethylzymosterol) lanosterol can be considered a precursor of zymosterol in the cholesterol synthesis pathway. The conversion of zymosterol into cholesterol happens in the endoplasmic reticulum. Zymosterol accumulates quickly in the plasma membrane coming from the cytosol. The movement of zymosterol across the cytosol is more than twice as fast as the movement of cholesterol itself.

Zymosterol
Ball-and-stick model of zymosterol
Names
IUPAC name
5α-Cholesta-8,24-dien-3β-ol
Systematic IUPAC name
(1R,3aR,5aS,7S,9aS,11aR)-9a,11a-Dimethyl-1-[(2R)-6-methylhept-5-en-2-yl]-2,3,3a,4,5,5a,6,7,8,9,9a,10,11,11a-tetradecahydro-1H-cyclopenta[a]phenanthren-7-ol
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.004.438 Edit this at Wikidata
UNII
  • InChI=1S/C27H44O/c1-18(2)7-6-8-19(3)23-11-12-24-22-10-9-20-17-21(28)13-15-26(20,4)25(22)14-16-27(23,24)5/h7,19-21,23-24,28H,6,8-17H2,1-5H3/t19-,20+,21+,23-,24+,26+,27-/m1/s1 ☒N
    Key: CGSJXLIKVBJVRY-XTGBIJOFSA-N ☒N
  • InChI=1/C27H44O/c1-18(2)7-6-8-19(3)23-11-12-24-22-10-9-20-17-21(28)13-15-26(20,4)25(22)14-16-27(23,24)5/h7,19-21,23-24,28H,6,8-17H2,1-5H3/t19-,20+,21+,23-,24+,26+,27-/m1/s1
    Key: CGSJXLIKVBJVRY-XTGBIJOFBJ
  • O[C@H]4CC[C@@]3(/C2=C(/[C@@H]1CC[C@H]([C@H](C)CC\C=C(/C)C)[C@@]1(C)CC2)CC[C@H]3C4)C
Properties
C27H44O
Molar mass 384.64 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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