16658-76-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 16658-76-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,6,5 and 8 respectively; the second part has 2 digits, 7 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 16658-76:
(7*1)+(6*6)+(5*6)+(4*5)+(3*8)+(2*7)+(1*6)=137
137 % 10 = 7
So 16658-76-7 is a valid CAS Registry Number.