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187039-58-3

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187039-58-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 187039-58-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,7,0,3 and 9 respectively; the second part has 2 digits, 5 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 187039-58:
(8*1)+(7*8)+(6*7)+(5*0)+(4*3)+(3*9)+(2*5)+(1*8)=163
163 % 10 = 3
So 187039-58-3 is a valid CAS Registry Number.

187039-58-3Relevant articles and documents

A short synthesis of an important precursor to a new class of bicyclic β-lactamase inhibitors

Bellettini, John R.,Miller, Marvin J.

, p. 167 - 168 (1997)

A short synthesis of an important precursor to known bicyclic β-lactamase inhibitors is described. The synthesis uses commercially available trans-3-hydroxy-L-proline 1. Protection of the amino group followed by formation of the hydroxamate and cyclization using Mitsunobu conditions afforded bicyclic β-lactam 4 in three steps in 53% overall yield.

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