1657-85-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1657-85-8 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 5 respectively.
Calculate Digit Verification of CAS Registry Number 1657-85:
(6*1)+(5*6)+(4*5)+(3*7)+(2*8)+(1*5)=98
98 % 10 = 8
So 1657-85-8 is a valid CAS Registry Number.