16693-91-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 16693-91-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,6,9 and 3 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 16693-91:
(7*1)+(6*6)+(5*6)+(4*9)+(3*3)+(2*9)+(1*1)=137
137 % 10 = 7
So 16693-91-7 is a valid CAS Registry Number.