21665-11-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21665-11-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,6,6 and 5 respectively; the second part has 2 digits, 1 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 21665-11:
(7*2)+(6*1)+(5*6)+(4*6)+(3*5)+(2*1)+(1*1)=92
92 % 10 = 2
So 21665-11-2 is a valid CAS Registry Number.