57221-43-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 57221-43-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,2,2 and 1 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 57221-43:
(7*5)+(6*7)+(5*2)+(4*2)+(3*1)+(2*4)+(1*3)=109
109 % 10 = 9
So 57221-43-9 is a valid CAS Registry Number.