133261-19-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 133261-19-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,3,2,6 and 1 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 133261-19:
(8*1)+(7*3)+(6*3)+(5*2)+(4*6)+(3*1)+(2*1)+(1*9)=95
95 % 10 = 5
So 133261-19-5 is a valid CAS Registry Number.
133261-19-5Relevant articles and documents
PROCESS FOR THE PREPARATION OF TAMSULOSIN
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Page/Page column 9-10, (2010/02/11)
There is provided a process for the preparation of tamsulosin of formula 5, involving a coupling reaction in the presence of an aluminum reagent between an ester of formula 2A and (R)-5-(2-amino)propyl-2-methoxy-benzenesulfonamide of formula 3 to yield tamsulosin amide, which is then reduced to yield tamsulosin.
