420838-41-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 420838-41-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,2,0,8,3 and 8 respectively; the second part has 2 digits, 4 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 420838-41:
(8*4)+(7*2)+(6*0)+(5*8)+(4*3)+(3*8)+(2*4)+(1*1)=131
131 % 10 = 1
So 420838-41-1 is a valid CAS Registry Number.