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640741-04-4

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640741-04-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 640741-04-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,0,7,4 and 1 respectively; the second part has 2 digits, 0 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 640741-04:
(8*6)+(7*4)+(6*0)+(5*7)+(4*4)+(3*1)+(2*0)+(1*4)=134
134 % 10 = 4
So 640741-04-4 is a valid CAS Registry Number.

640741-04-4Relevant academic research and scientific papers

Pyrido[2,3-d]pyrimidines and their ribofuranosides: Synthesis and antimicrobial investigations

Kumar, Naresh,Tiwari, Sangeeta,Yadav, Ashok K.

, p. 702 - 706 (2008/09/18)

4-Amino-5,7-disubstituted pyrido[2,3-d]pyrimidines 3, 4amino-5,7- disubstituted pyrido[2,3-d]pyrimidine-2(1H)-thiones 4, and 4-amino-3,5,7- trisubstituted pyrido [2,3-d]pyrimidines-2,4(1H, 3H)-dione 5 have been synthesized by condensation of 2amino-3-cyan

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