1211-56-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1211-56-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,2,1 and 1 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 1211-56:
(6*1)+(5*2)+(4*1)+(3*1)+(2*5)+(1*6)=39
39 % 10 = 9
So 1211-56-9 is a valid CAS Registry Number.