21209-87-0 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21209-87-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,2,0 and 9 respectively; the second part has 2 digits, 8 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 21209-87:
(7*2)+(6*1)+(5*2)+(4*0)+(3*9)+(2*8)+(1*7)=80
80 % 10 = 0
So 21209-87-0 is a valid CAS Registry Number.