198639-80-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 198639-80-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,8,6,3 and 9 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 198639-80:
(8*1)+(7*9)+(6*8)+(5*6)+(4*3)+(3*9)+(2*8)+(1*0)=204
204 % 10 = 4
So 198639-80-4 is a valid CAS Registry Number.