6421-27-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 6421-27-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,4,2 and 1 respectively; the second part has 2 digits, 2 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 6421-27:
(6*6)+(5*4)+(4*2)+(3*1)+(2*2)+(1*7)=78
78 % 10 = 8
So 6421-27-8 is a valid CAS Registry Number.