221636-53-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221636-53-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,6,3 and 6 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 221636-53:
(8*2)+(7*2)+(6*1)+(5*6)+(4*3)+(3*6)+(2*5)+(1*3)=109
109 % 10 = 9
So 221636-53-9 is a valid CAS Registry Number.