21563-31-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21563-31-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,5,6 and 3 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 21563-31:
(7*2)+(6*1)+(5*5)+(4*6)+(3*3)+(2*3)+(1*1)=85
85 % 10 = 5
So 21563-31-5 is a valid CAS Registry Number.