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157020-35-4

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157020-35-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 157020-35-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,0,2 and 0 respectively; the second part has 2 digits, 3 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 157020-35:
(8*1)+(7*5)+(6*7)+(5*0)+(4*2)+(3*0)+(2*3)+(1*5)=104
104 % 10 = 4
So 157020-35-4 is a valid CAS Registry Number.

157020-35-4Relevant articles and documents

A novel enantioselective synthesis of (+)-biotin

Deroose, Frederik D.,De Clercq, Pierre J.

, p. 2615 - 2618 (1994)

A conceptually attractive enantioselective 12-step synthesis of (+)-biotin from L-cysteine is reported based upon an intramolecular 1,3-dipolar cycloaddition sequence involving as key-steps (i) the macrothiolactonisation of acid 3 to Z-olefin (4), (ii) the thermolysis of the ene carbamoyl azide 5 in water with direct formation of a mixture of the benzylated derivative of (+)-biotin 6a and 6b.

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