690991-31-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 690991-31-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,9,0,9,9 and 1 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 690991-31:
(8*6)+(7*9)+(6*0)+(5*9)+(4*9)+(3*1)+(2*3)+(1*1)=202
202 % 10 = 2
So 690991-31-2 is a valid CAS Registry Number.