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55243-82-8

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55243-82-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 55243-82-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,5,2,4 and 3 respectively; the second part has 2 digits, 8 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 55243-82:
(7*5)+(6*5)+(5*2)+(4*4)+(3*3)+(2*8)+(1*2)=118
118 % 10 = 8
So 55243-82-8 is a valid CAS Registry Number.

55243-82-8Relevant articles and documents

7-Acylamino-3-acyl-2(or 3)cephems

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, (2008/06/13)

Intermediate C-3 1-hydroxyalkyl or 1-hydroxyarylalkyl cephems, prepared by reacting Grignard reagents at low temperature with 3-formyl-2-cephem compounds, are oxidized to the corresponding 7-acylamino-3-acyl-2(or 3)cephem-4-carboxylic acids and esters thereof, which are useful as antibiotics or as intermediates in preparing antibiotic substances.

3,4-Dicarboxycephalosporins and derivatives

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, (2008/06/13)

7-Acylamino and 7-amino-3-carboxy-3-cephem-4-carboxylic acids and derivatives thereof, which are useful as antibiotics or as intermediates in preparing antibiotic substances, are prepared by an NBS oxidation of acetal derivatives of 3-formyl cephalosporin

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