221092-57-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221092-57-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,0,9 and 2 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 221092-57:
(8*2)+(7*2)+(6*1)+(5*0)+(4*9)+(3*2)+(2*5)+(1*7)=95
95 % 10 = 5
So 221092-57-5 is a valid CAS Registry Number.