21985-81-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21985-81-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,9,8 and 5 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 21985-81:
(7*2)+(6*1)+(5*9)+(4*8)+(3*5)+(2*8)+(1*1)=129
129 % 10 = 9
So 21985-81-9 is a valid CAS Registry Number.