21428-17-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21428-17-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,4,2 and 8 respectively; the second part has 2 digits, 1 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 21428-17:
(7*2)+(6*1)+(5*4)+(4*2)+(3*8)+(2*1)+(1*7)=81
81 % 10 = 1
So 21428-17-1 is a valid CAS Registry Number.