17802-20-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 17802-20-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,8,0 and 2 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 17802-20:
(7*1)+(6*7)+(5*8)+(4*0)+(3*2)+(2*2)+(1*0)=99
99 % 10 = 9
So 17802-20-9 is a valid CAS Registry Number.