21455-91-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21455-91-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,4,5 and 5 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 21455-91:
(7*2)+(6*1)+(5*4)+(4*5)+(3*5)+(2*9)+(1*1)=94
94 % 10 = 4
So 21455-91-4 is a valid CAS Registry Number.