Phensuximide

Also known as: Milontin, Lifene, Epimid, PM 334, N-Methyl-2-phenylsuccinimide, 1-Methyl-3-phenyl-2,5-pyrrolidinedione, 1-Methyl-3-phenylpyrrolidin-2,5-dione, 1-methyl-3-phenylsuccinimide, Phensuccimide, Succitimal, Fensuximide, Methylphenylsuccinimide, (+/-)-N-Methyl-2-phenylsuccinimide, 1-methyl-3-phenyl-pyrrolidine-2,5-dione, 1-methyl-3-phenyl-5-pyrrolidinedione, 1-methyl-3-phenyl-pyrrolidine-2,5-quinone, Epimal, Lifen, Milonton, Mirontin

Phensuximide (CAS 86-34-0) is a compound in the Organic Bases category listed in the Jingsj chemical database. It has the molecular formula C11H11NO2 and a molecular weight of 189.21100 g/mol. Key properties include a melting point of 71-73°, a boiling point of 324.47°C (rough estimate) and a density of 1.1596 (rough estimate). No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 86-34-0
Jingsj CID: J-1339102-1
Molecular Formula: C₁₁H₁₁NO₂
Molecular Weight: 189.21100 g/mol
Category: Organic Bases
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	71-73°
Boiling Point	324.47°C (rough estimate)
Density	1.1596 (rough estimate)
Exact Mass	189.07900
PSA	37.38000
LogP	1.09680
Refractive Index	1.5012 (estimate)
Storage Conditions	2-8°C

Activity & Biological Data

Target	IC50: cyclic AMP and cyclic GMP accumulation[2]
Additional Information	[1]. G O Rankin, et al. Urinary Tract Effects of Phensuximide in the Sprague-Dawley and Fischer 344 Rat. J Appl Toxicol. . 1986 Oct;6(5):349-56. [2]. J A Ferrendelli, et al. Inhibitory Effects of Anticonvulsant Drugs on Cyclic Nucleotide Accumulation in Brain. Ann Neurol. 1979 Jun;5(6):533-8. [3]. J G MILLICHAP, et al. Milontin: A New Drug in the Treatment of Petit Mal.Lancet. 1952 Nov 8;2(6741):907-10. [4]. S D Hall,et al. Characterization and inhibition of mephenytoin 4-hydroxylase activity in human liver microsomes. The JOURNAL OP PHARMAcOLOGY AND EXPERIMENTAL THERAPEUTICS

Target

IC50: cyclic AMP and cyclic GMP accumulation[2]

Additional Information

[1]. G O Rankin, et al. Urinary Tract Effects of Phensuximide in the Sprague-Dawley and Fischer 344 Rat. J Appl Toxicol. . 1986 Oct;6(5):349-56. [2]. J A Ferrendelli, et al. Inhibitory Effects of Anticonvulsant Drugs on Cyclic Nucleotide Accumulation in Brain. Ann Neurol. 1979 Jun;5(6):533-8. [3]. J G MILLICHAP, et al. Milontin: A New Drug in the Treatment of Petit Mal.Lancet. 1952 Nov 8;2(6741):907-10. [4]. S D Hall,et al. Characterization and inhibition of mephenytoin 4-hydroxylase activity in human liver microsomes. The JOURNAL OP PHARMAcOLOGY AND EXPERIMENTAL THERAPEUTICS

Customs & Trade Information

HS Code	2925190090
Summary	2925190090 other imides and their derivatives; salts thereof VAT:17.0% Tax rebate rate:9.0% Supervision conditions:none MFN tariff:6.5% General tariff:30.0%

Frequently Asked Questions

What is the CAS number of Phensuximide?

The CAS number of Phensuximide is 86-34-0.

What are the molecular formula and molecular weight of Phensuximide?

Phensuximide has molecular formula C11H11NO2 and molecular weight 189.21100 g/mol.

What are the upstream and downstream products of Phensuximide?

For Phensuximide, Upstream Products: N-Methylmaleimide, DL-Phenylsuccinic acid.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "Phensuximide (CAS 86-34-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1339102-1 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.