643031-40-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 643031-40-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,3,0,3 and 1 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 643031-40:
(8*6)+(7*4)+(6*3)+(5*0)+(4*3)+(3*1)+(2*4)+(1*0)=117
117 % 10 = 7
So 643031-40-7 is a valid CAS Registry Number.