171781-56-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 171781-56-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,1,7,8 and 1 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 171781-56:
(8*1)+(7*7)+(6*1)+(5*7)+(4*8)+(3*1)+(2*5)+(1*6)=149
149 % 10 = 9
So 171781-56-9 is a valid CAS Registry Number.