2-[2-(2-methoxyethoxy)ethoxy]ethanethiol

Also known as: MPEG3-SH, m-PEG3-thiol, Thiol-PEG3-methyl, mPEG3-SH, 1-(1-Ethoxyethoxy)-2-methoxyethanethiol, 1-mercapto-4,7,10-trioxaundecane, 2-<2-(2-methoxyethoxy)ethoxy>ethylthiol, 2-Methoxy[2-ethoxy(2-ethoxy)]-1-ethanethiol, Ethanethiol, 2-[2-(2-methoxyethoxy)ethoxy]-

2-[2-(2-methoxyethoxy)ethoxy]ethanethiol (CAS 31521-83-2) is a compound in the Alcohols category listed in the Jingsj chemical database. It has the molecular formula C7H16O3S and a molecular weight of 180.26500 g/mol. Key property: a density of 1.017. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 31521-83-2
Jingsj CID: J-1973665-3
Molecular Formula: C₇H₁₆O₃S
Molecular Weight: 180.26500 g/mol
Category: Alcohols
Last updated: 8/21/2026

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Physicochemical Properties

Density	1.017
Exact Mass	180.08200
PSA	66.49000
LogP	1.28780

Activity & Biological Data

Target	PEGs
Additional Information	[1]. An S, et al. Small-molecule PROTACs: An emerging and promising approach for the development of targeted therapy drugs. EBioMedicine. 2018 Oct;36:553-562.

Customs & Trade Information

HS Code	2930909090
Summary	2930909090. other organo-sulphur compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 2-[2-(2-methoxyethoxy)ethoxy]ethanethiol?

The CAS number of 2-[2-(2-methoxyethoxy)ethoxy]ethanethiol is 31521-83-2.

What are the molecular formula and molecular weight of 2-[2-(2-methoxyethoxy)ethoxy]ethanethiol?

2-[2-(2-methoxyethoxy)ethoxy]ethanethiol has molecular formula C7H16O3S and molecular weight 180.26500 g/mol.

What are the upstream and downstream products of 2-[2-(2-methoxyethoxy)ethoxy]ethanethiol?

For 2-[2-(2-methoxyethoxy)ethoxy]ethanethiol, Upstream Products: Triethylene glycol monomethyl ether, Diethylene Glycol 2-Bromoethyl Methyl Ether, Tetraethylene glycol di-p-tosylate.

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. "2-[2-(2-methoxyethoxy)ethoxy]ethanethiol (CAS 31521-83-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1973665-3 (accessed 2026-11-09).

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