664978-54-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 664978-54-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,4,9,7 and 8 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 664978-54:
(8*6)+(7*6)+(6*4)+(5*9)+(4*7)+(3*8)+(2*5)+(1*4)=225
225 % 10 = 5
So 664978-54-5 is a valid CAS Registry Number.