3721-16-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 3721-16-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,7,2 and 1 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 3721-16:
(6*3)+(5*7)+(4*2)+(3*1)+(2*1)+(1*6)=72
72 % 10 = 2
So 3721-16-2 is a valid CAS Registry Number.