1658-57-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1658-57-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,6,5 and 8 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 1658-57:
(6*1)+(5*6)+(4*5)+(3*8)+(2*5)+(1*7)=97
97 % 10 = 7
So 1658-57-7 is a valid CAS Registry Number.