71138-53-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 71138-53-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,1,3 and 8 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 71138-53:
(7*7)+(6*1)+(5*1)+(4*3)+(3*8)+(2*5)+(1*3)=109
109 % 10 = 9
So 71138-53-9 is a valid CAS Registry Number.