WARNING: This product is for research use only, not for human or veterinary use.

MedKoo CAT#: 466241

CAS#: 2765091-45-8

Description: 2A3 is an electrophilic chemical probe that acylates the 2'-OH in the RNA backbone. 2A3 can be used for RNA SHAPE-MaP experiments in cell lines or live bacteria. It labels single-stranded or flexible regions more than folded regions (SHAPE methodology) and enables analysis of RNA secondary structures at single nucleotide resolution. For intracellular experiments, 2A3 has higher signal-to-noise ratio and prediction accuracy than NAI. 2A3 is cell permeable, and can probe both gram-positive and gram-negative bacteria.

Chemical Structure

CAS# 2765091-45-8

Theoretical Analysis

MedKoo Cat#: 466241
Name: 2A3
CAS#: 2765091-45-8
Chemical Formula: C9H8N4O
Exact Mass: 188.0698
Molecular Weight: 188.19
Elemental Analysis: C, 57.44; H, 4.29; N, 29.77; O, 8.50

Price and Availability

Size Price Availability Quantity
10.0mg USD 480.0 2 Weeks
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Synonym: 2A-3; 2A 3; 2A3; 2 A3; 2-A3;

IUPAC/Chemical Name: (2-aminopyridin-3-yl)(1H-imidazol-1-yl)methanone


InChi Code: InChI=1S/C9H8N4O/c10-8-7(2-1-3-12-8)9(14)13-5-4-11-6-13/h1-6H,(H2,10,12)


Appearance: Solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: To be determined

Shelf Life: >2 years if stored properly

Drug Formulation: To be determined

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

Solubility Data

Solvent Max Conc. mg/mL Max Conc. mM
DMSO 18.82 100.0

Preparing Stock Solutions

The following data is based on the product molecular weight 188.19 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL

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1: Marinus T, Fessler AB, Ogle CA, Incarnato D. A novel SHAPE reagent enables the analysis of RNA structure in living cells with unprecedented accuracy. Nucleic Acids Res. 2021 Apr 6;49(6):e34. doi: 10.1093/nar/gkaa1255. PMID: 33398343; PMCID: PMC8034653.


10.0mg / USD 480.0