666820-99-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 666820-99-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,6,8,2 and 0 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 666820-99:
(8*6)+(7*6)+(6*6)+(5*8)+(4*2)+(3*0)+(2*9)+(1*9)=201
201 % 10 = 1
So 666820-99-1 is a valid CAS Registry Number.