3720-21-6 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 3720-21-6 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 0 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 3720-21:
(6*3)+(5*7)+(4*2)+(3*0)+(2*2)+(1*1)=66
66 % 10 = 6
So 3720-21-6 is a valid CAS Registry Number.