643767-71-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 643767-71-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,3,7,6 and 7 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 643767-71:
(8*6)+(7*4)+(6*3)+(5*7)+(4*6)+(3*7)+(2*7)+(1*1)=189
189 % 10 = 9
So 643767-71-9 is a valid CAS Registry Number.