217658-18-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 217658-18-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,7,6,5 and 8 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 217658-18:
(8*2)+(7*1)+(6*7)+(5*6)+(4*5)+(3*8)+(2*1)+(1*8)=149
149 % 10 = 9
So 217658-18-9 is a valid CAS Registry Number.