669709-39-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 669709-39-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,9,7,0 and 9 respectively; the second part has 2 digits, 3 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 669709-39:
(8*6)+(7*6)+(6*9)+(5*7)+(4*0)+(3*9)+(2*3)+(1*9)=221
221 % 10 = 1
So 669709-39-1 is a valid CAS Registry Number.