642980-34-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 642980-34-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,2,9,8 and 0 respectively; the second part has 2 digits, 3 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 642980-34:
(8*6)+(7*4)+(6*2)+(5*9)+(4*8)+(3*0)+(2*3)+(1*4)=175
175 % 10 = 5
So 642980-34-5 is a valid CAS Registry Number.