7203-21-6 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 7203-21-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,2,0 and 3 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 7203-21:
(6*7)+(5*2)+(4*0)+(3*3)+(2*2)+(1*1)=66
66 % 10 = 6
So 7203-21-6 is a valid CAS Registry Number.