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Description of key information

OECD 420, 2017 - The acute oral toxicity of the Reaction mass of (4R)-4-(2-methoxypropan-2-yl)-1-methylcyclohexene and cis-1-methoxy-4-(2-methoxypropan-2-yl)-1-methylcyclohexane in the Wistar strain rat was investigated using the fixed dose method (OECD 420).

Following a sighting test at a dose level of 2000 mg/kg, an additional four fasted female animals were given a single oral dose of test item at a dose level of 2000 mg/kg body weight.  Clinical signs and body weight development were monitored during the study.  All animals were subjected to gross necropsy.

There were no deaths.  There were no signs of systemic toxicity.  All animals showed expected gains in body weight.

Under the study condition the acute oral median lethal dose (LD50) of the test item in the female Wistar strain rat was estimated to be greater than 2000 mg/kg body weight.

Key value for chemical safety assessment

Acute toxicity: via oral route

Link to relevant study records
Reference
Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
04 October - 02 November 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study was conducted in accordance with international guidelines and in acordance with GLP. All guideline criteria were met.
Qualifier:
according to
Guideline:
OECD Guideline 420 (Acute Oral Toxicity - Fixed Dose Method)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method B.1 bis (Acute Oral Toxicity - Fixed Dose Procedure)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Test type:
fixed dose procedure
Limit test:
yes
Specific details on test material used for the study:
RADIOLABELLING INFORMATION (if applicable)
- Radiochemical purity: N/A
- Specific activity: N/A
- Locations of the label: N/A
- Expiration date of radiochemical substance: N/A

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: Room temperature in the dark under nitrogen
- Stability under test conditions: Assumed stable
- Solubility and stability of the test substance in the solvent/vehicle: N/A
- Reactivity of the test substance with the solvent/vehicle of the cell culture medium: N/A

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing: N/A
- Preliminary purification step (if any): N/A
- Final dilution of a dissolved solid, stock liquid or gel: N/A
- Final preparation of a solid: N/A

FORM AS APPLIED IN THE TEST (if different from that of starting material)

OTHER SPECIFICS: N/A
Species:
rat
Strain:
Wistar
Sex:
female
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: Envigo RMS (UK) Limited
- Females (if applicable) nulliparous and non-pregnant: Yes
- Age at study initiation: 8-12 weeks
- Weight at study initiation: Body weight variation did not exceed ±20% of the mean body weight at the start of treatment.
- Fasting period before study: Overnight fast immediately prior to study initiation
- Housing: 4 rats housed per suspended solid floor polypropylene cage (furnished with woodshavings).
- Diet (e.g. ad libitum): Ad libitum- except 3-4 hours after dosing during which time rate were fasted.
- Water (e.g. ad libitum): Ad libitum- except 3-4 hours after dosing during which time rate were fasted.
- Acclimation period: 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19-25
- Humidity (%): 30-70
- Air changes (per hr): >15
- Photoperiod (hrs dark / hrs light): 12 / 12

IN-LIFE DATES: From: 04 Oct 2016 To: 02 Nov 2016
Route of administration:
oral: gavage
Vehicle:
unchanged (no vehicle)
Details on oral exposure:
MAXIMUM DOSE VOLUME APPLIED: 2000 mg/kg bw

DOSAGE PREPARATION (if unusual): N/A

CLASS METHOD (if applicable)
- Rationale for the selection of the starting dose: Sighting test at 2000 mg/kg bw (1 rat) concluded no toxic effect.
Doses:
All animals were dosed once only by gavage, using a metal cannula attached to a graduated syringe. The volume of test item administered to each animal was calculated according to the fasted body weight at the time of dosing.

A total of five animals were treated at a dose level of 2000 mg/kg in the study (1 in the sighting test and 4 in the main test).
No. of animals per sex per dose:
1 female in the sighting test (2000 mg/kg bw)
4 females in the main test (2000 mg/kg bw)
Control animals:
no
Details on study design:
- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: 0.5, 1, 2 and 4 hours after dosing. Twice daily, early and late during the normal working day, and once daily at weekends (and public holidays) thereafter.
- Necropsy of survivors performed: Yes
- Other examinations performed: clinical signs, body weight, macroscopic observations
Statistics:
Not required.
Key result
Sex:
female
Dose descriptor:
LD50
Effect level:
> 2 000 mg/kg bw
Based on:
test mat.
Remarks on result:
not determinable due to absence of adverse toxic effects
Mortality:
There were no deaths.
Clinical signs:
No signs of systemic toxicity were noted during the observation period.
Body weight:
All animals showed expected gains in body weight over the observation period.
Gross pathology:
No abnormalities were noted at necropsy.

Table 1: Individual Clinical Observations and Mortality Data

Dose Level

(mg/kg)

Animal No. and Sex

Effect Noted After Dosing

(h)

Effects Noted During Period After Dosing

(Day)

0.5

1

2

4

1

2

3

4

5

6

7

8

9

10

11

12

13

14

2000

1-0

Female

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

2-0

Female

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

2-1

Female

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

2-2

Female

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

2-3

Female

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0 = no signs of systemic toxicity

Table 2: Individual Body Weights and Body Weight Changes

Dose Level
mg/kg

Animal Number
and Sex

Body Weight (g) at Day

Body Weight Gain (g) During Week

0

7

14

1

2

2000

1-0 Female

160

189

199

29

10

2-0 Female

162

180

200

18

20

2-1 Female

165

187

203

22

16

2-2 Female

185

199

219

14

20

2-3 Female

166

190

221

24

31

Table 3: Individual Necropsy Findings

Dose Level
mg/kg

Animal Number
and Sex

Time of Death

Macroscopic Observations

2000

1-0 Female

Killed Day 14

No abnormalities detected

2-0 Female

Killed Day 14

No abnormalities detected

2-1 Female

Killed Day 14

No abnormalities detected

2-2 Female

Killed Day 14

No abnormalities detected

2-3 Female

Killed Day 14

No abnormalities detected

Interpretation of results:
Category 5 based on GHS criteria
Conclusions:
Based upon the condition of this study the acute oral median lethal dose (LD50) of the test item in the female Wistar strain rat was estimated to be greater than 2000 mg/kg body weight (Globally Harmonized Classification System Unclassified).
Executive summary:

The acute oral toxicity of the Reaction mass of (4R)-4-(2-methoxypropan-2-yl)-1-methylcyclohexene and cis-1-methoxy-4-(2-methoxypropan-2-yl)-1-methylcyclohexane in the Wistar strain rat was investigated using the fixed dose method (OECD 420). Following a sighting test at a dose level of 2000 mg/kg, an additional four fasted female animals were given a single oral dose of test item at a dose level of 2000 mg/kg body weight.  Clinical signs and body weight development were monitored during the study. All animals were subjected to gross necropsy.

Under the study condition the acute oral median lethal dose (LD50) of the test item in the female Wistar strain rat was estimated to be greater than 2000 mg/kg body weight (Globally Harmonized Classification System- unclassified).

Endpoint conclusion
Endpoint conclusion:
no adverse effect observed
Dose descriptor:
discriminating dose
Value:
2 000 mg/kg bw
Quality of whole database:
Study was conducted in accordance with international guidelines and in accordance with GLP. All guideline criteria were met therefore the results from this test can be regarded as uniequivocal.

Acute toxicity: via inhalation route

Endpoint conclusion
Endpoint conclusion:
no study available

Acute toxicity: via dermal route

Endpoint conclusion
Endpoint conclusion:
no study available

Additional information

Justification for classification or non-classification

OECD 420, 2017 - The acute oral toxicity of the Reaction mass of (4R)-4-(2-methoxypropan-2-yl)-1-methylcyclohexene and cis-1-methoxy-4-(2-methoxypropan-2-yl)-1-methylcyclohexane in the Wistar strain rat was investigated using the fixed dose method (OECD 420).

Following a sighting test at a dose level of 2000 mg/kg, an additional four fasted female animals were given a single oral dose of test item at a dose level of 2000 mg/kg body weight.  Clinical signs and body weight development were monitored during the study.  All animals were subjected to gross necropsy.

There were no deaths.  There were no signs of systemic toxicity.  All animals showed expected gains in body weight.  No abnormalities were noted at necropsy.

Further, there was no evidence to suggest that GHS category 5 would be relevant for protection of vulnerable populations.  Testing to 5000 mg/kg is discouraged unless there is strong evidence that the results of such testing would have direct relevance to to the protection of human health.

The substance does not meet the criteria for acute toxicity based on current GHS or CLP criteria.