20494-57-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 20494-57-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,4,9 and 4 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 20494-57:
(7*2)+(6*0)+(5*4)+(4*9)+(3*4)+(2*5)+(1*7)=99
99 % 10 = 9
So 20494-57-9 is a valid CAS Registry Number.