21040-11-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21040-11-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,0,4 and 0 respectively; the second part has 2 digits, 1 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 21040-11:
(7*2)+(6*1)+(5*0)+(4*4)+(3*0)+(2*1)+(1*1)=39
39 % 10 = 9
So 21040-11-9 is a valid CAS Registry Number.