1217544-28-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1217544-28-9 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,1,7,5,4 and 4 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 1217544-28:
(9*1)+(8*2)+(7*1)+(6*7)+(5*5)+(4*4)+(3*4)+(2*2)+(1*8)=139
139 % 10 = 9
So 1217544-28-9 is a valid CAS Registry Number.