667890-21-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 667890-21-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,7,8,9 and 0 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 667890-21:
(8*6)+(7*6)+(6*7)+(5*8)+(4*9)+(3*0)+(2*2)+(1*1)=213
213 % 10 = 3
So 667890-21-3 is a valid CAS Registry Number.