20550-18-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 20550-18-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,5,5 and 0 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 20550-18:
(7*2)+(6*0)+(5*5)+(4*5)+(3*0)+(2*1)+(1*8)=69
69 % 10 = 9
So 20550-18-9 is a valid CAS Registry Number.