Registration Dossier

Administrative data

Endpoint:
acute toxicity: dermal
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Comparable to guideline study with acceptable restrictions (occlusive treatment, 24 h exposure, incomplete documentation)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1973
Report date:
1973

Materials and methods

Test guideline
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 402 (Acute Dermal Toxicity)
Deviations:
yes
Remarks:
(occlusive treatment, 24 h treatment)
GLP compliance:
no
Test type:
standard acute method
Limit test:
yes

Test material

Constituent 1
Reference substance name:
5,5'-(1H-isoindole-1,3(2H)-diylidene)dibarbituric acid
EC Number:
253-256-2
EC Name:
5,5'-(1H-isoindole-1,3(2H)-diylidene)dibarbituric acid
Cas Number:
36888-99-0
IUPAC Name:
5,5'-(1H-isoindole-1,3(2H)-diylidene)dipyrimidine-2,4,6(1H,3H,5H)-trione
Details on test material:
- Physical state: solid
- Analytical purity: no data

Test animals

Species:
rat
Strain:
Sprague-Dawley
Sex:
male/female
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source: Wiga, Ottobrunn, Germany
- Weight at study initiation: mean weight: males 151 g, females 129 g

ENVIRONMENTAL CONDITIONS: not reported

Administration / exposure

Type of coverage:
occlusive
Vehicle:
water
Details on dermal exposure:
TEST SITE
- Area of exposure: dorsal, p.c., 50 cm²
- % coverage: > 10 %

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 2.5 g/kg animal
- Concentration (if solution): 50 % aequous solution
- For solids, paste formed: yes

Duration of exposure:
24 h
Doses:
2.5 g/kg bw
No. of animals per sex per dose:
5
Control animals:
no
Details on study design:
- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: No weighing was done. Observation was several times at the day of exposure and daily on working days.
- Necropsy of survivors performed: yes
Statistics:
None

Results and discussion

Effect levels
Sex:
male/female
Dose descriptor:
LD50
Effect level:
> 2 500 mg/kg bw
Based on:
test mat.
Remarks on result:
other: No mortality and no clinical signs were observed.
Mortality:
0/10 animals died after the exposure
Clinical signs:
no abnormalities detected
Body weight:
not recorded
Gross pathology:
9/10 no abnormalities detected
1/10 right peak pulmonary lobe with chronic Bronchopneumonia
Other findings:
- Other observations: after 24 h local orange substance residues

Applicant's summary and conclusion

Interpretation of results:
practically nontoxic
Remarks:
Migrated information Criteria used for interpretation of results: EU