42521-21-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 42521-21-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,2,5,2 and 1 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 42521-21:
(7*4)+(6*2)+(5*5)+(4*2)+(3*1)+(2*2)+(1*1)=81
81 % 10 = 1
So 42521-21-1 is a valid CAS Registry Number.