1642-75-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1642-75-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,6,4 and 2 respectively; the second part has 2 digits, 7 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 1642-75:
(6*1)+(5*6)+(4*4)+(3*2)+(2*7)+(1*5)=77
77 % 10 = 7
So 1642-75-7 is a valid CAS Registry Number.