21004-07-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21004-07-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,0,0 and 4 respectively; the second part has 2 digits, 0 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 21004-07:
(7*2)+(6*1)+(5*0)+(4*0)+(3*4)+(2*0)+(1*7)=39
39 % 10 = 9
So 21004-07-9 is a valid CAS Registry Number.