221558-25-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221558-25-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,5,5 and 8 respectively; the second part has 2 digits, 2 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 221558-25:
(8*2)+(7*2)+(6*1)+(5*5)+(4*5)+(3*8)+(2*2)+(1*5)=114
114 % 10 = 4
So 221558-25-4 is a valid CAS Registry Number.