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221877-09-4

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221877-09-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 221877-09-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,8,7 and 7 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 221877-09:
(8*2)+(7*2)+(6*1)+(5*8)+(4*7)+(3*7)+(2*0)+(1*9)=134
134 % 10 = 4
So 221877-09-4 is a valid CAS Registry Number.

221877-09-4Downstream Products

221877-09-4Relevant academic research and scientific papers

Synthesis and biological evaluation of α,α-difluorobenzylphosphonic acid derivatives as small molecular inhibitors of protein-tyrosine phosphatase 1B

Yokomatsu, Tsutomu,Murano, Tetsuo,Umesue, Ikuko,Soeda, Shinji,Shimeno, Hiroshi,Shibuya, Shiroshi

, p. 529 - 532 (2007/10/03)

A series of α,α-difluorobenzylphosphonic acids having a hydrophobic functional group were prepared via the Stille coupling reaction from halogenated α,α-difluorobenzylphosphonates. Evaluation of inhibitory activity toward protein tyrosine phosphatase (PTP 1B) revealed that the ethynyl, phenylethynyl and (E)-styryl groups on the benzene nuclei increased the inhibitory activity of α,α-difluorobenzylphosphonic acid. Inhibitory activities significantly increased upon introducing both (E)-styryl and bis- methylsulfonamide functional groups onto the benzene nuclei of α,α- difluorobenzylphosphonic acid.

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