66561-16-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 66561-16-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,5,6 and 1 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 66561-16:
(7*6)+(6*6)+(5*5)+(4*6)+(3*1)+(2*1)+(1*6)=138
138 % 10 = 8
So 66561-16-8 is a valid CAS Registry Number.