21905-04-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21905-04-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,9,0 and 5 respectively; the second part has 2 digits, 0 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 21905-04:
(7*2)+(6*1)+(5*9)+(4*0)+(3*5)+(2*0)+(1*4)=84
84 % 10 = 4
So 21905-04-4 is a valid CAS Registry Number.