521-33-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 521-33-5 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,2 and 1 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 521-33:
(5*5)+(4*2)+(3*1)+(2*3)+(1*3)=45
45 % 10 = 5
So 521-33-5 is a valid CAS Registry Number.