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19553-22-1

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19553-22-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 19553-22-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,5,5 and 3 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 19553-22:
(7*1)+(6*9)+(5*5)+(4*5)+(3*3)+(2*2)+(1*2)=121
121 % 10 = 1
So 19553-22-1 is a valid CAS Registry Number.

19553-22-1Relevant articles and documents

Structure of the Dioxygenase AsqJ: Mechanistic Insights into a One-Pot Multistep Quinolone Antibiotic Biosynthesis

Br?uer, Alois,Beck, Philipp,Hintermann, Lukas,Groll, Michael

, p. 422 - 426 (2016)

Multienzymatic cascades are responsible for the biosynthesis of natural products and represent a source of inspiration for synthetic chemists. The FeII/α-ketoglutarate-dependent dioxygenase AsqJ from Aspergillus nidulans is outstanding because it stereoselectively catalyzes both a ferryl-induced desaturation reaction and epoxidation on a benzodiazepinedione. Interestingly, the enzymatically formed spiro epoxide spring-loads the 6,7-bicyclic skeleton for non-enzymatic rearrangement into the 6,6-bicyclic scaffold of the quinolone alkaloid 4′-methoxyviridicatin. Herein, we report different crystal structures of the protein in the absence and presence of synthesized substrates, surrogates, and intermediates that mimic the various stages of the reaction cycle of this exceptional dioxygenase.

Stereospecific synthesis of dl-cyclopenin and dl-cyclopenol.

White,Haefliger,Dimsdale

, p. 233 - 242 (2007/10/07)

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