220504-99-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 220504-99-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,0,5,0 and 4 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 220504-99:
(8*2)+(7*2)+(6*0)+(5*5)+(4*0)+(3*4)+(2*9)+(1*9)=94
94 % 10 = 4
So 220504-99-4 is a valid CAS Registry Number.
220504-99-4Relevant articles and documents
The first direct transformation of 2,2'-dihydroxychalcones into coumestans
Kamara, B. Irene,Brandt, E. Vincent,Ferreira, Daneel
, p. 861 - 868 (1999)
Three coumestans, flemichapparin, medicagol and sophoracoumestan B, are synthesised by direct reaction of the analogous 2,2'-dihydroxychalcones with thallium (III) nitrate in methanol.