19771-65-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 19771-65-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,7,7 and 1 respectively; the second part has 2 digits, 6 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 19771-65:
(7*1)+(6*9)+(5*7)+(4*7)+(3*1)+(2*6)+(1*5)=144
144 % 10 = 4
So 19771-65-4 is a valid CAS Registry Number.