16905-80-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 16905-80-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,9,0 and 5 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 16905-80:
(7*1)+(6*6)+(5*9)+(4*0)+(3*5)+(2*8)+(1*0)=119
119 % 10 = 9
So 16905-80-9 is a valid CAS Registry Number.