666821-52-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 666821-52-9 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 1 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 666821-52:
(8*6)+(7*6)+(6*6)+(5*8)+(4*2)+(3*1)+(2*5)+(1*2)=189
189 % 10 = 9
So 666821-52-9 is a valid CAS Registry Number.