161721-52-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 161721-52-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,1,7,2 and 1 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 161721-52:
(8*1)+(7*6)+(6*1)+(5*7)+(4*2)+(3*1)+(2*5)+(1*2)=114
114 % 10 = 4
So 161721-52-4 is a valid CAS Registry Number.