91057-81-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 91057-81-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,0,5 and 7 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 91057-81:
(7*9)+(6*1)+(5*0)+(4*5)+(3*7)+(2*8)+(1*1)=127
127 % 10 = 7
So 91057-81-7 is a valid CAS Registry Number.