91639-80-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 91639-80-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,6,3 and 9 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 91639-80:
(7*9)+(6*1)+(5*6)+(4*3)+(3*9)+(2*8)+(1*0)=154
154 % 10 = 4
So 91639-80-4 is a valid CAS Registry Number.