17981-18-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 17981-18-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,9,8 and 1 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 17981-18:
(7*1)+(6*7)+(5*9)+(4*8)+(3*1)+(2*1)+(1*8)=139
139 % 10 = 9
So 17981-18-9 is a valid CAS Registry Number.