203131-81-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 203131-81-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,3,1,3 and 1 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 203131-81:
(8*2)+(7*0)+(6*3)+(5*1)+(4*3)+(3*1)+(2*8)+(1*1)=71
71 % 10 = 1
So 203131-81-1 is a valid CAS Registry Number.