91905-31-6 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 91905-31-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,9,0 and 5 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 91905-31:
(7*9)+(6*1)+(5*9)+(4*0)+(3*5)+(2*3)+(1*1)=136
136 % 10 = 6
So 91905-31-6 is a valid CAS Registry Number.