1640968-91-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1640968-91-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,4,0,9,6 and 8 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 1640968-91:
(9*1)+(8*6)+(7*4)+(6*0)+(5*9)+(4*6)+(3*8)+(2*9)+(1*1)=197
197 % 10 = 7
So 1640968-91-7 is a valid CAS Registry Number.