137993-57-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 137993-57-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,9,9 and 3 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 137993-57:
(8*1)+(7*3)+(6*7)+(5*9)+(4*9)+(3*3)+(2*5)+(1*7)=178
178 % 10 = 8
So 137993-57-8 is a valid CAS Registry Number.
137993-57-8Relevant academic research and scientific papers
Rhodium catalyzed cyclization process for bicyclic β-lactams
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, (2008/06/13)
1-Carbapenam-2-one-3-carboxylic acid and 1-carba-3-hydroxy-3-cephem-4-carboxylic acid and esters thereof are provided by a process comprising a rhodium C2 -C10 carboxylate catalyzed cyclization of an ester of a 4-(1-alkoxy- or 1-subs
