15665-90-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 15665-90-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,5,6,6 and 5 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 15665-90:
(7*1)+(6*5)+(5*6)+(4*6)+(3*5)+(2*9)+(1*0)=124
124 % 10 = 4
So 15665-90-4 is a valid CAS Registry Number.