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20999-51-3

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20999-51-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20999-51-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,9,9 and 9 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 20999-51:
(7*2)+(6*0)+(5*9)+(4*9)+(3*9)+(2*5)+(1*1)=133
133 % 10 = 3
So 20999-51-3 is a valid CAS Registry Number.

20999-51-3Downstream Products

20999-51-3Relevant articles and documents

Condensation of anthranilic acids with pyridines to furnish pyridoquinazolones via pyridine dearomatization

Yang, Yajun,Zhu, Cuiju,Zhang, Min,Huang, Shijun,Lin, Jingjing,Pan, Xiandao,Su, Weiping

supporting information, p. 12869 - 12872 (2016/11/06)

The unprecedented carbodiimide-mediated condensation between pyridines and anthranilic acids via pyridine dearomatization at room temperature has been developed to provide a straightforward approach to pyridoquinazolones. The value of this approach has further been demonstrated by its application to one-step, gram-scale syntheses of a series of pyridoquinazolone-based natural products and their analogues from readily available starting materials.

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