Enalapril maleate (Ref: MK 421)

Enalapril maleate (Ref: MK 421)	Last updated: 14/04/2021
(Also known as: Renitek)

Data alerts

The following alerts are based on the data in the tables below. An absence of an alert does not imply the substance has no implications for human health, biodiversity or the environment but just that we do not have the data to form a judgement.

Environmental fate	Ecotoxicity	Human health
	Ecotoxicity Low alert: Fish acute ecotoxicity: Low; Daphnia acute ecotoxicity: Low Warning: Significant data are missing	Human health High alert: Reproduction/development effects

GENERAL INFORMATION

Description

A veterinary prodrug used to treat hypertension, symptomatic heart failure, and asymptomatic left ventricular dysfunction

Availability status

Current

Introduction & key dates

Examples of species treated

Cats; Dogs

Chemical structure

Isomerism

Isomeric

Chemical formula

C₂₄H₃₂N₂O₉

Canonical SMILES

CCOC(=O)C(CCC1=CC=CC=C1)NC(C)C(=O)N2CCCC2C(=O)O.C(=CC(=O)O)C(=O)O

Isomeric SMILES

CCOC(=O)[C@H](CCC1=CC=CC=C1)N[C@@H](C)C(=O)N2CCC[C@H]2C(=O)O.C(=C\C(=O)O)\C(=O)O

International Chemical Identifier key (InChIKey)

OYFJQPXVCSSHAI-QFPUQLAESA-N

International Chemical Identifier (InChI)

InChI=1S/C20H28N2O5.C4H4O4/c1-3-27-20(26)16(12-11-15-8-5-4-6-9-15)21-14(2)18(23)22-13-7-10-17(22)19(24)25;5-3(6)1-2-4(7)8/h4-6,8-9,14,16-17,21H,3,7,10-13H2,1-2H3,(H,24,25);1-2H,(H,5,6)(H,7,8)/b;2-1-/t14-,16-,17-;/m0./s1

2D structure diagram/image available?

Yes

General status

Veterinary substance type

Medicinal drug: hypertension agent

Substance groups

Peptide

Minimum active substance purity

Known relevant impurities

Substance origin

Synthetic

Mode of action

Undergoes biotransformation to the active enalaprilat. An angiotensin-converting-enzyme (ACE) inhibitor; Blocks the angiotensin-converting enzyme.

Molecular targets

[Angiotensin-converting enzyme, Inhibitor]

CAS RN

76095-16-4

Alternative/old CAS RN

75847-73-3

EC number

278-375-7

CIPAC number

US EPA chemical code

PubChem CID

ATCvet Code

QC09AA02

Therapeutic Class

Agents acting on the renin-angiotensin system: ACE inhibitors, plain; Antihypertensive drug

Controlled Drug?

Regulation 37/2010 MRL Classification

Molecular mass

492.52

PIN (Preferred Identification Name)

(S)-1-(N-(1-(Ethoxycarbonyl)-3-phenylpropyl)-L-alanyl)-L-proline

IUPAC name

(S)-1-((S)-2-(1-((S)-ethoxycarbonyl)-3-phenyl-propylamino)-propionyl)-pyrrolidine-2-carboxylic acid

CAS name

1-(N-((S)-1-Carboxy-3-phenylpropyl)-L-alanyl)-L-proline 1'-ethyl ester

Other status information

Relevant Environmental Water Quality Standards

Physical state

White to off-white crystalline powder

Formulations

Property

Product

Manufacturer

Authorisation Route

UK Legal Class

Example products using this active

Enacard Tablets for Dogs 1 mg

Merial Animal Health

UK National authorisation

Prescription only medicine to be authorised by a veterinarian (POM-V)

Prilenal 10 mg, Tablets

Ceva Animal Health Ltd

EU Mutually recognised procedure

Prescription only medicine to be authorised by a veterinarian (POM-V)

Formulation and application details

Usually supplied in tablet form for oral administration

ENVIRONMENTAL FATE

Property

Value

Source; quality score; and other information

Interpretation

Solubility - In water at 20 °C (mg l⁻¹)

16400

at 25 °C

High

Solubility - In organic solvents at 20 °C (mg l⁻¹)

80.0

Ethanol

200

Methanol

Melting point (°C)

143

Boiling point (°C)

165.3

Degradation point (°C)

Flashpoint (°C)

416.7

Octanol-water partition coefficient at pH 7, 20 °C

1.17 X 10⁰⁰

Calculated

Log P

0.07

Low

Fat solubility of residues

Solubility

Data type

Density (g ml⁻¹)

Dissociation constant pKa) at 25 °C

2.97

pKa(2)=5.35

Vapour pressure at 20 °C (mPa)

Henry's law constant at 25 °C (Pa m³ mol⁻¹)

Maximum UV-vis absorption L mol⁻¹ cm⁻¹

Surface tension (mN m⁻¹)

Refractive Index

Degradation

Property

Value

Source; quality score; and other information

Interpretation

Soil degradation (days) (aerobic)

DT₅₀ (typical)

DT₅₀ (lab at 20 °C)

DT₅₀ (field)

DT₉₀ (lab at 20 °C)

DT₉₀ (field)

Note

Manure DT₅₀ (days)

Aqueous photolysis DT₅₀ (days) at pH 7

Value

Note

Aqueous hydrolysis DT₅₀ (days) at 20 °C and pH 7

Value

Note

Water-sediment DT₅₀ (days)

Water phase only DT₅₀ (days)

Soil adsorption and mobility

Property

Value

Source; quality score; and other information

Interpretation

Linear

K_d

K_oc

Notes and range

Freundlich

K_f

K_foc

¹/_n

Notes and range

pH sensitivity

Fate indices

Property

Value

Source; quality score; and other information

Interpretation

GUS leaching potential index

Bio-concentration factor

BCF (l kg⁻¹)

CT₅₀ (days)

Known soil and groundwater metabolites

None

Other known metabolites

Metabolite name and reference

Aliases

Formation medium / Rate

Estimated maximum occurrence fraction

Metabolising enzymes

enalapril

Animals inc. humans

ECOTOXICOLOGY

Terrestrial ecotoxicology

Property

Value

Source; quality score; and other information

Interpretation

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

2973

Rat

Low

Mammals - Short term dietary NOEL

(mg kg⁻¹)

(ppm diet)

Mammals - Chronic 21d NOAEL (mg kg⁻¹ bw d⁻¹)

Birds - Acute LD₅₀ (mg kg⁻¹)

Birds - Short term dietary (LC₅₀/LD₅₀)

Birds - Chronic 21d NOEL (mg kg⁻¹ bw d⁻¹)

Earthworms - Acute 14 day LC₅₀ (mg kg⁻¹)

Earthworms - Chronic NOEC, reproduction (mg kg⁻¹)

Soil micro-organisms

Collembola

Acute LC₅₀ (mg kg⁻¹)

Chronic NOEC (mg kg⁻¹)

Non-target plants

Honeybees (Apis spp.)

Contact acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Oral acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Unknown mode acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Chronic

Bumblebees (Bombus spp.)

Contact acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Oral acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Mason bees (Osmia spp.)

Contact acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Oral acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg bee⁻¹)

Other pollinators (1)

Acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg insect⁻¹)

Mode of exposure

Other pollinators (2)

Acute LD₅₀ (worst case from 24, 48 and 72 hour values - μg insect⁻¹)

Mode of exposure

Beneficial insects (Ladybirds)

Beneficial insects (Lacewings)

Beneficial insects (Parasitic wasps)

Beneficial insects (Predatory mites)

Beneficial insects (Ground beetles)

Aquatic ecotoxicology

Property

Value

Source; quality score; and other information

Interpretation

Fish - Acute 96 hour LC₅₀ (mg l⁻¹)

> 1000

Pimephales promelas

Low

Fish - Chronic 21 day NOEC (mg l⁻¹)

Aquatic invertebrates - Acute 48 hour EC₅₀ (mg l⁻¹)

354

Daphnia magna

Low

Aquatic invertebrates - Chronic 21 day NOEC (mg l⁻¹)

Aquatic crustaceans - Acute 96 hour LC₅₀ (mg l⁻¹)

Sediment dwelling organisms - Acute 96 hour LC₅₀ (mg l⁻¹)

Sediment dwelling organisms - Chronic 28 day NOEC, static, water (mg l⁻¹)

Sediment dwelling organisms - Chronic 28 day NOEC, sediment (mg kg⁻¹)

Aquatic plants - Acute 7 day EC₅₀, biomass (mg l⁻¹)

Algae - Acute 72 hour EC₅₀, growth (mg l⁻¹)

Algae - Chronic 96 hour NOEC, growth (mg l⁻¹)

Mesocosm study data

NOEAEC mg l⁻¹

HUMAN HEALTH AND PROTECTION

General

Property

Value

Source; quality score; and other information

Interpretation

Threshold of Toxicological Concern (Cramer Class)

High (class III)

Mammals - Acute oral LD₅₀ (mg kg⁻¹)

2973

Rat

Low

Mammals - Dermal LD₅₀ (mg kg⁻¹ body weight)

Mammals - Inhalation LC₅₀ (mg l⁻¹)

Other Mammal toxicity endpoints

Subcutaneous LD₅₀ = 1418 mg kg⁻¹

Rat

Intravenous LD₅₀ = 849 mg kg⁻¹

Rat

ADI - Acceptable Daily Intake (mg kg⁻¹ bw day⁻¹)

ARfD - Acute Reference Dose (mg kg⁻¹ bw day⁻¹)

AAOEL - Acute Acceptable Operator Exposure Level (mg kg⁻¹ bw day⁻¹)

AOEL - Acceptable Operator Exposure Level - Systemic (mg kg⁻¹ bw day⁻¹)

Dermal penetration studies (%)

Dangerous Substances Directive 76/464

Exposure Routes

Public

Occupational

Mammalian dose elimination route and rate

Hepatic metabolism, renal excretion. Some evidence of some loss in maternal milk

Health issues

Specific human health issues

Carcinogen

Genotoxic

Endocrine disruptor

; ; ; ;

Reproduction / development effects

Acetyl cholinesterase inhibitor

Neurotoxicant

No data found

Respiratory tract irritant

Skin irritant

Skin sensitiser

No data found

Eye irritant

Phototoxicant

No data found

General human health issues

May cause dizziness, low blood pressure, synope and a dry cough
Possible kidney toxicant

Handling issues

Property

Value and interpretation

General

Will produce toxic gases when heated to decomposition
Reactive with oxidising agents

CLP classification 2013

WHO Classification

NL (Not listed)

UN Number

Waste disposal & packaging

TRANSLATIONS

Language

Name

English

enalapril maleate

French

German

Danish

Italian

Spanish

Greek

Polish

Swedish

Hungarian

Dutch

Record last updated:	14/04/2021
Contact:	aeru@herts.ac.uk
Please cite as:	Lewis, K.A., Tzilivakis, J., Warner, D. and Green, A. (2016) An international database for pesticide risk assessments and management. Human and Ecological Risk Assessment: An International Journal, 22(4), 1050-1064. DOI: 10.1080/10807039.2015.1133242