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926209-59-8

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926209-59-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 926209-59-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,2,6,2,0 and 9 respectively; the second part has 2 digits, 5 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 926209-59:
(8*9)+(7*2)+(6*6)+(5*2)+(4*0)+(3*9)+(2*5)+(1*9)=178
178 % 10 = 8
So 926209-59-8 is a valid CAS Registry Number.

926209-59-8Upstream product

926209-59-8Relevant articles and documents

An improved synthetic route for preparative process of vardenafil

Mao, Yongjun,Tian, Guanghui,Liu, Zheng,Shen, Jingshan,Shen, Jingkang

, p. 1206 - 1208 (2009)

A new, convergent synthetic route for the process optimization of vardenafil (Levitra), a potent and effective PDE5 inhibitor, is described. Key improved steps in the preparative process are that the chlorosulfonation reaction is at the beginning and the dehydration-cyclisation reaction is at a later stage so that the synthetic route has a better overall yield and simpler workup operations. The yield of vardenafil produced from this synthetic route is around 45% over seven steps with purity at 99.2% (HPLC).

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