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263559-19-9

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263559-19-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 263559-19-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,6,3,5,5 and 9 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 263559-19:
(8*2)+(7*6)+(6*3)+(5*5)+(4*5)+(3*9)+(2*1)+(1*9)=159
159 % 10 = 9
So 263559-19-9 is a valid CAS Registry Number.

263559-19-9Relevant articles and documents

Stereoselective synthesis of 2-azetidinones as cholesterol-absorption inhibitors

Annunziata, Rita,Benaglia, Maurizio,Cinquini, Mauro,Cozzi, Franco

, p. 4841 - 4849 (2007/10/03)

The synthesis of two 2-azetidinones possessing powerful cholesterol- absorption inhibition properties has been accomplished by a short and highly stereoselective reaction sequence. The key step is the condensation of the titanium enolate of the easily prepared 2-pyridylthioester (R)-11 with imine 6 which affords the desired β-lactam intermediate in the correct relative and absolute configuration. Conversion to the pharmacologically active compounds is readily accomplished by simple functional group manipulation. (C) 2000 Elsevier Science Ltd.

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