Chemical substance record

Cyclooctasulfur

10544-50-0S₈256.536 g/mol

ElementChEBI source record

A homomonocyclic compound composed of eight sulfur atoms. It has been isolated from Ganoderma lucidum, a mushroom commonly used in Chinese medicine. — ChEBI

Safety references

Safety documents & references

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Identity & molecular properties

Source-linked values

CAS number	10544-50-0	ChEBI ↗
Molecular formula	S₈	ChEBI ↗
Molar mass	256.536 g/mol	ChEBI ↗
Monoisotopic mass	255.77657 Da	ChEBI ↗
Formal charge	0	ChEBI ↗
ChEBI identifier	CHEBI:29385	ChEBI ↗

Names & structural identifiers

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Source preferred name

cyclooctasulfur

IUPAC name

octathiocane

InChIKey

JLQNHALFVCURHW-UHFFFAOYSA-N

SMILES

S1SSSSSSS1

InChI

InChI=1S/S8/c1-2-4-6-8-7-5-3-1

Names & synonyms

octathiocane

Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.

Classification & relationships

ChEBI ontology

elemental sulfurChEBI parent class · 33403 ↗homomonocyclic compoundChEBI parent class · 36913 ↗

elemental molecular entity inorganic molecular entity

Roles recorded in ChEBI

fungal metabolitebacterial metabolite

Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.

Mass ↔ amount of substance

Calculated from sourced mass

Amount

Input unit

Equivalent amount

0.00389809 mol

Uses 256.536 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.

Elemental composition

Theoretical mass fractions

S

Sulfur · 8 atoms

100.00%

Calculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.

Research & patent references

Selected source associations

Microbial consumption of zero-valence sulfur in marine benthic habitats. ↗Environmental microbiology · 2014 Nov · PMID 24467476

Anti-allergic constituents in the culture medium of Ganoderma lucidum. (II). The inhibitory effect of cyclooctasulfur on histamine release. ↗Agents and actions · 1988 Apr · PMID 2455976

FR2984178 · Patent reference ↗Patent cross-reference supplied by ChEBI. Association alone does not establish claim scope.

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Sources & record history

Checked 27 Sep 2026

Identity, formula, mass, synonyms & ontologyEMBL-EBI ChEBI · CHEBI:29385

Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0

PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.

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