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1991-93-1

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1991-93-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1991-93-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,9,9 and 1 respectively; the second part has 2 digits, 9 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 1991-93:
(6*1)+(5*9)+(4*9)+(3*1)+(2*9)+(1*3)=111
111 % 10 = 1
So 1991-93-1 is a valid CAS Registry Number.
InChI:InChI=1/C12H14N2O2/c1-7-2-3-9-8(5-10(13)12(15)16)6-14-11(9)4-7/h2-4,6,10,14H,5,13H2,1H3,(H,15,16)/t10-/m0/s1

1991-93-1Relevant articles and documents

METHODS FOR PRODUCING D-TRYPTOPHAN AND SUBSTITUTED D-TRYPTOPHANS

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Page/Page column 17-18, (2021/04/01)

Single-module nonribosomal peptide synthetases (NRPSs) and NRPS-like enzymes activate and transform carboxylic acids in both primary and secondary metabolism; and are of great interest due to their biocatalytic potentials. The single-module NRPS IvoA is essential for fungal pigment biosynthesis. As disclosed herein, we show that IvoA catalyzes ATP-dependent unidirectional stereoinversion of L-tryptophan to D-tryptophan with complete conversion. While the stereoinversion is catalyzed by the epimerization (E) domain, the terminal condensation (C) domain stereoselectively hydrolyzes D-tryptophanyl-S-phosphopantetheine thioester and thus represents a noncanonical C domain function. Using IvoA, we demonstrate a biocatalytic stereoinversion/deracemization route to access a variety of substituted D-tryptophan analogs in high enantiomeric excess.

Complete Stereoinversion of l -Tryptophan by a Fungal Single-Module Nonribosomal Peptide Synthetase

Hai, Yang,Jenner, Matthew,Tang, Yi

supporting information, p. 16222 - 16226 (2019/10/14)

Single-module nonribosomal peptide synthetases (NRPSs) and NRPS-like enzymes activate and transform carboxylic acids in both primary and secondary metabolism and are of great interest due to their biocatalytic potentials. The single-module NRPS IvoA is essential for fungal pigment biosynthesis. Here, we show that IvoA catalyzes ATP-dependent unidirectional stereoinversion of l-tryptophan to d-tryptophan with complete conversion. While the stereoinversion is catalyzed by the epimerization (E) domain, the terminal condensation (C) domain stereoselectively hydrolyzes d-tryptophanyl-S-phosphopantetheine thioester and thus represents a noncanonical C domain function. Using IvoA, we demonstrate a biocatalytic stereoinversion/deracemization route to access a variety of substituted d-tryptophan analogs in high enantiomeric excess.

COMPOSITIONS AND METHODS FOR CYCLOFRUCTANS AS SEPARATION AGENTS

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Page/Page column 45-49; 61, (2010/12/31)

The present invention relates to derivatized cyclofructan compounds, compositions comprising derivatized cyclofructan compounds, and methods of using compositions comprising derivatized cyclofructan compounds for chromatographic separations of chemical species, including enantiomers. Said compositions may comprise a solid support and/or polymers comprising derivatized cyclofructan compounds.

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