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  • 908401 - 1-Methyl-7-nitroisatoic anhydride

908401 Sigma-Aldrich

1-Methyl-7-nitroisatoic anhydride

Synonym: 1-Methyl-7-nitro-2H-3,1-benzoxazine-2,4(1H)-dione, 1-methyl-7-nitro-2H-3,1-Benzoxazine-2,4(1H)-dione, 1M7, RNA SHAPE probe, Reagent for RNA SHAPE-MaP

  • CAS Number 73043-80-8

  • Empirical Formula (Hill Notation) C9H6N2O5

  • Molecular Weight 222.15

  •  MDL number MFCD18432729




1-Methyl-7-nitroisatoic anhydride (1M7) is used as an in vivo SHAPE-MaP reagent for live cell RNA structure analysis at single nucleotide resolution. SHAPE -- or selective 2′-hydroxyl acylation analyzed by primer extension -- uses small, electrophilic chemical probes such as 1M7 to react with the 2′-hydroxyl group and provides insight to RNA structure. When combined with mutational profiling (MaP), quantitative nucleotide measurements are possible for entire transciptomes. Together, these methods deepen the understanding of RNA interactions and regions that may be exploited for design of RNA-targeting small-molecule drugs.

Other Notes

Pervasive Regulatory Functions of mRNA Structure Revealed by High-Resolution SHAPE Probing

SnapShot: RNA Structure Probing Technologies

Detection of RNA-Protein Interactions in Living Cells with SHAPE

Standardization of RNA Chemical Mapping Experiments

In-cell RNA structure probing with SHAPE-MaP

A Fast-Acting Reagent for Accurate Analysis of RNA Secondary and Tertiary Structure by SHAPE Chemistry

Safety & Documentation

Safety Information

WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


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03-310 In Vivo SHAPE Reagent for Live Cell RNA Structure Analysis, In Vivo SHAPE Reagent contains 2-methylnicotinic acid imidazolide (NAI). This reagent has very low toxicity and permits the analysis of RNA structure in living cells using Selective 2’-Hydroxyl Acylation and Primer Extension (SHAPE).
913839 2-Methylnicotinic acid imidazolide
914983 ThT-NE, ≥95%
115959 Benzoyl cyanide, 98%
320293 Dimethyl sulfate, ≥99%

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