20331-99-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 20331-99-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,3,3 and 1 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 20331-99:
(7*2)+(6*0)+(5*3)+(4*3)+(3*1)+(2*9)+(1*9)=71
71 % 10 = 1
So 20331-99-1 is a valid CAS Registry Number.