1641-70-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1641-70-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,6,4 and 1 respectively; the second part has 2 digits, 7 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 1641-70:
(6*1)+(5*6)+(4*4)+(3*1)+(2*7)+(1*0)=69
69 % 10 = 9
So 1641-70-9 is a valid CAS Registry Number.