217657-78-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 217657-78-8 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 7 respectively; the second part has 2 digits, 7 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 217657-78:
(8*2)+(7*1)+(6*7)+(5*6)+(4*5)+(3*7)+(2*7)+(1*8)=158
158 % 10 = 8
So 217657-78-8 is a valid CAS Registry Number.