21258-42-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21258-42-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,2,5 and 8 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 21258-42:
(7*2)+(6*1)+(5*2)+(4*5)+(3*8)+(2*4)+(1*2)=84
84 % 10 = 4
So 21258-42-4 is a valid CAS Registry Number.