202931-77-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 202931-77-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,2,9,3 and 1 respectively; the second part has 2 digits, 7 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 202931-77:
(8*2)+(7*0)+(6*2)+(5*9)+(4*3)+(3*1)+(2*7)+(1*7)=109
109 % 10 = 9
So 202931-77-9 is a valid CAS Registry Number.