20172-72-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 20172-72-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,1,7 and 2 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 20172-72:
(7*2)+(6*0)+(5*1)+(4*7)+(3*2)+(2*7)+(1*2)=69
69 % 10 = 9
So 20172-72-9 is a valid CAS Registry Number.