16991-60-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 16991-60-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,9,9 and 1 respectively; the second part has 2 digits, 6 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 16991-60:
(7*1)+(6*6)+(5*9)+(4*9)+(3*1)+(2*6)+(1*0)=139
139 % 10 = 9
So 16991-60-9 is a valid CAS Registry Number.