666854-21-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 666854-21-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,6,8,5 and 4 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 666854-21:
(8*6)+(7*6)+(6*6)+(5*8)+(4*5)+(3*4)+(2*2)+(1*1)=203
203 % 10 = 3
So 666854-21-3 is a valid CAS Registry Number.