3509-23-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 3509-23-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,5,0 and 9 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 3509-23:
(6*3)+(5*5)+(4*0)+(3*9)+(2*2)+(1*3)=77
77 % 10 = 7
So 3509-23-7 is a valid CAS Registry Number.