1209-42-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1209-42-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,2,0 and 9 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 1209-42:
(6*1)+(5*2)+(4*0)+(3*9)+(2*4)+(1*2)=53
53 % 10 = 3
So 1209-42-3 is a valid CAS Registry Number.