91138-31-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 91138-31-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,1,3 and 8 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 91138-31:
(7*9)+(6*1)+(5*1)+(4*3)+(3*8)+(2*3)+(1*1)=117
117 % 10 = 7
So 91138-31-7 is a valid CAS Registry Number.