7542-89-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 7542-89-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,5,4 and 2 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 7542-89:
(6*7)+(5*5)+(4*4)+(3*2)+(2*8)+(1*9)=114
114 % 10 = 4
So 7542-89-4 is a valid CAS Registry Number.