17658-85-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 17658-85-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,6,5 and 8 respectively; the second part has 2 digits, 8 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 17658-85:
(7*1)+(6*7)+(5*6)+(4*5)+(3*8)+(2*8)+(1*5)=144
144 % 10 = 4
So 17658-85-4 is a valid CAS Registry Number.