Fmoc-N-methyl-L-aspartic acid 4-tert-butyl ester

Also known as: Fmoc-N-Me-Asp(OtBu)-OH, N-[(9H-Fluoren-9-ylmethoxy)carbonyl]-N-methyl-L-aspartic acid 4-tert-butyl ester, (2S)-4-tert-Butoxy-2-{[(9H-fluoren-9-ylmethoxy)carbonyl](methyl)amino}-4-oxobutanoic acid, (2S)-2-{[(9H-Fluoren-9-ylmethoxy)carbonyl](methyl)amino}-4-[(2-methyl-2-propanyl)oxy]-4-oxobutanoic acid, N-alpha-(9-Fluorenylmethyloxycarbonyl)-N-alpha-methyl-L-aspartic acid beta-tert-butyl ester, Fmoc-MeAsp(OtBu)-OH, FMOC-L-MEASP(TBU)-OH, MFCD00237027

Fmoc-N-methyl-L-aspartic acid 4-tert-butyl ester (CAS 152548-66-8) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C24H27NO6 and a molecular weight of 425.474 g/mol. Key properties include a melting point of 135-140°C, a boiling point of 598.7±50.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 315.9±30.1 °C. It is classified under GHS with signal word Warning and hazard statements H410 — Very toxic to aquatic life with long lasting effects. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 152548-66-8
Jingsj CID: J-1986326-4
Molecular Formula: C₂₄H₂₇NO₆
Molecular Weight: 425.474 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	135-140°C
Boiling Point	598.7±50.0 °C at 760 mmHg
Density	1.2±0.1 g/cm3
Flash Point	315.9±30.1 °C
Exact Mass	425.183838
PSA	93.14000
LogP	5.65
Vapor Pressure	0.0±1.8 mmHg at 25°C
Refractive Index	1.575
Storage Conditions	-15°C

GHS Safety & Compliance

Environmental HazardSignal word: Warning

H410 — Very toxic to aquatic life with long lasting effects

Activity & Biological Data

Additional Information	[1]. Luckose F, et al. Effects of amino acid derivatives on physical, mental, and physiological activities. Crit Rev Food Sci Nutr. 2015;55(13):1793-1144.

Frequently Asked Questions

What is the CAS number of Fmoc-N-methyl-L-aspartic acid 4-tert-butyl ester?

The CAS number of Fmoc-N-methyl-L-aspartic acid 4-tert-butyl ester is 152548-66-8.

What are the molecular formula and molecular weight of Fmoc-N-methyl-L-aspartic acid 4-tert-butyl ester?

Fmoc-N-methyl-L-aspartic acid 4-tert-butyl ester has molecular formula C24H27NO6 and molecular weight 425.474 g/mol.

Is Fmoc-N-methyl-L-aspartic acid 4-tert-butyl ester hazardous?

Fmoc-N-methyl-L-aspartic acid 4-tert-butyl ester has GHS signal word Warning and hazard statements H410 — Very toxic to aquatic life with long lasting effects.

What are the upstream and downstream products of Fmoc-N-methyl-L-aspartic acid 4-tert-butyl ester?

For Fmoc-N-methyl-L-aspartic acid 4-tert-butyl ester, Upstream Products: Methanol, 9-Fluorenylmethyl chloroformate, L-Aspartic acid 4-tert-butyl ester.

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. "Fmoc-N-methyl-L-aspartic acid 4-tert-butyl ester (CAS 152548-66-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1986326-4 (accessed 2026-11-09).

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