20221-54-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 20221-54-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,2,2 and 1 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 20221-54:
(7*2)+(6*0)+(5*2)+(4*2)+(3*1)+(2*5)+(1*4)=49
49 % 10 = 9
So 20221-54-9 is a valid CAS Registry Number.