# Spiro(2,4-dithia-1-methyl-8-oxabicyclo(3.3.0)octane-3,3'-(1'-oxa-2'-methyl)cyclopentane)

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**Safety rating:** UNKNOWN
**CAS number:** 38325-25-6
**Category:** flavoring
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-04

## Summary

Spiro(2,4-dithia-1-methyl-8-oxabicyclo(3.3.0)octane-3,3'-(1'-oxa-2'-methyl)cyclopentane) is a synthetic flavoring compound containing sulfur and oxygen atoms in a complex bicyclic structure. It functions as a flavor enhancer and flavoring agent in food products.

## Regulatory status

| Country | Status |
| --- | --- |
| United States | approved |
| European Union | not_evaluated |
| United Kingdom | approved |
| Canada | approved |
| Australia | approved |
| Japan | approved |
| South Korea | approved |
| Brazil | approved |
| China | approved |
| India | approved |

## Detailed analysis

## What is Spiro(2,4-dithia-1-methyl-8-oxabicyclo(3.3.0)octane-3,3'-(1'-oxa-2'-methyl)cyclopentane)?

Spiro(2,4-dithia-1-methyl-8-oxabicyclo(3.3.0)octane-3,3'-(1'-oxa-2'-methyl)cyclopentane), identified by CAS Number 38325-25-6, is a synthetic organic compound used in food manufacturing. The molecule features a distinctive spirocyclic structure—two ring systems connected at a single carbon atom—with integrated sulfur and oxygen atoms. This unique chemical architecture contributes to its flavor properties and sensory characteristics.

## Common Uses

This additive is classified as a flavoring agent and flavor enhancer, meaning it is used to improve or modify the taste profile of food and beverage products. Like other synthetic flavor compounds, it would typically be incorporated into processed foods at very low concentrations to achieve desired sensory outcomes. The specific food applications and concentration levels depend on manufacturer formulations and regulatory permissions in different jurisdictions.

## Safety Assessment

According to FDA records, there have been no reported adverse events associated with this additive and no product recalls linked to its use. The absence of adverse event reports suggests it has not been identified as causing consumer health complaints in the United States. However, it is important to note that the lack of reported adverse events does not constitute formal safety approval—it indicates no safety issues have been flagged through routine monitoring systems.

As with many synthetic flavoring compounds, safety evaluation typically involves toxicological testing protocols assessing acute toxicity, genotoxicity, and potential systemic effects. The specific identity and properties of spirocyclic flavor compounds mean they are evaluated individually rather than as a class. Standard testing approaches for flavor substances examine exposure levels and potential hazards through established methodologies.

## Regulatory Status

This additive has not received FDA GRAS (Generally Recognized As Safe) status. GRAS status is a voluntary determination that allows manufacturers to use substances without pre-market FDA approval if they meet specific criteria based on scientific procedures or a history of safe use. The absence of GRAS status for this particular compound means it would require different regulatory pathways for use in food products in the United States.

The regulatory treatment of flavor compounds varies internationally. Different countries and regions maintain distinct approval processes and lists of permitted flavoring substances. Manufacturers seeking to use this ingredient would need to comply with applicable regulations in their target markets, which may involve submitting safety data packages or petitions for approval.

## Key Studies

Published toxicological and chemical data specifically on this spirocyclic compound are limited in publicly available literature. Most information about its properties and safety would exist in proprietary industry reports, regulatory submissions, or specialized chemical databases. The compound's complexity and relatively narrow application in industrial flavoring suggest it has undergone manufacturer-level safety assessments, though these may not be published in peer-reviewed journals.

Research on related spirocyclic flavor compounds and sulfur-containing organic molecules provides relevant context for understanding structure-activity relationships in flavor chemistry. However, direct experimental evidence specific to this CAS number would be necessary for comprehensive safety conclusions.

For consumers, the practical significance of this additive relates to overall dietary exposure to synthetic flavoring substances. Food regulatory agencies establish acceptable intake levels for flavor compounds based on toxicological data, and manufacturers formulate products to remain within established safety margins.

## Sources

- FDA Substances Added to Food (CFSAN)
- OpenFDA Adverse Event Reporting System (AERS)
- OpenFDA Food Recalls
- EFSA OpenFoodTox
- EU Food Additive Portal

## Citation

Additive Facts. "Spiro(2,4-dithia-1-methyl-8-oxabicyclo(3.3.0)octane-3,3'-(1'-oxa-2'-methyl)cyclopentane) — Safety, regulation, and evidence." https://additivefacts.com/additives/spiro-2-4-dithia-1-methyl-8-oxabicyclo-3-3-0-octane-3-3-1-oxa-2-methyl-cyclopentane. Accessed 2026-05-20.