21565-83-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21565-83-3 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 5 respectively; the second part has 2 digits, 8 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 21565-83:
(7*2)+(6*1)+(5*5)+(4*6)+(3*5)+(2*8)+(1*3)=103
103 % 10 = 3
So 21565-83-3 is a valid CAS Registry Number.