117661-42-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 117661-42-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,7,6,6 and 1 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 117661-42:
(8*1)+(7*1)+(6*7)+(5*6)+(4*6)+(3*1)+(2*4)+(1*2)=124
124 % 10 = 4
So 117661-42-4 is a valid CAS Registry Number.