31891-19-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 31891-19-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,8,9 and 1 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 31891-19:
(7*3)+(6*1)+(5*8)+(4*9)+(3*1)+(2*1)+(1*9)=117
117 % 10 = 7
So 31891-19-7 is a valid CAS Registry Number.