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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Key value for chemical safety assessment

Effects on fertility

Effect on fertility: via oral route
Endpoint conclusion:
no study available
Effect on fertility: via inhalation route
Endpoint conclusion:
no study available
Effect on fertility: via dermal route
Endpoint conclusion:
no study available
Additional information
No studies are availabe for Carboxy-TH-naphthyridin (CAS No. 1050477-45-6). According to expert opinion a (weaker) pharmacological action of the compound cannot be ruled out due to the structural similarity to the active pharmaceutical ingredient (API; CAS No. 1050477-31-0). As the major findings of the toxicological studies with the API were considered to be related to its pharmacological action (selective, non steroidal mineralocorticoid receptor (MR) antagonist) a similar tolerability of the precursor is to be assumed. Although no in vitro assays, which reveal that Carboxy-TH-naphthyridin acts as (MR) antagonist, are available.

As part of the program of nonclinical studies for the development and registration of pharmaceuticals for human use data on fertility and early development in male and female rats (0, 3, 10, 30 mg/kg) are available for the API. In this study significant effects on reproductive parameters (the mean number of corpora lutea and thus the mean number of implantations sites and viable embryos were decreased at 30 mg/kg and absolute and relative ovary weights were decreased at 10 mg/kg and 30 mg/kg). The NOAEL for systemic tolerability was < 3 mg/kg. The NOAEL for fertility and early development was 3 mg/kg.

On the basis of these results API is allocated to Category 1B.

Effects on developmental toxicity

Effect on developmental toxicity: via oral route
Endpoint conclusion:
no study available
Effect on developmental toxicity: via inhalation route
Endpoint conclusion:
no study available
Effect on developmental toxicity: via dermal route
Endpoint conclusion:
no study available
Additional information
No studies are availabe for Carboxy-TH-naphthyridin (CAS No. 1050477-45-6). According to expert opinion a (weaker) pharmacological action of the compound cannot be ruled out due to the structural similarity to the active pharmaceutical ingredient (API; CAS No. 1050477-31-0). As the major findings of the toxicological studies with the API were considered to be related to its pharmacological action (selective, non steroidal mineralocorticoid receptor (MR) antagonist) a similar tolerability of the precursor is to be assumed. Although no in vitro assays, which reveal that Carboxy-TH-naphthyridin acts as (MR) antagonist, are available.

As part of the program of nonclinical studies for the development and registration of pharmaceuticals for human use data on prenatal developmental toxicity in rats (0; 0.3; 1; 3 mg/kg) and rabbits (0; 0.25; 0.75 and 2.5 mg/kg) are available for the API. The NOAEL for maternal toxicity was 3 mg/kg (rat) and 0.75 mg/kg (rabbit). The NOAEL for intrauterine development was 3 mg/kg (rat) and 2.5 mg/kg (rabbit).

On the the basis of these results no classification of the API is warranted.

Justification for classification or non-classification

According to the corresponding active pharmaceutical ingredient (CAS No. 1050477-31-0) the substance is classified in Category 1B (adverse effect on sexual function and fertility).

Additional information