1657-89-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1657-89-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,6,5 and 7 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 1657-89:
(6*1)+(5*6)+(4*5)+(3*7)+(2*8)+(1*9)=102
102 % 10 = 2
So 1657-89-2 is a valid CAS Registry Number.