The CAS Registry Mumber 820958-27-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,2,0,9,5 and 8 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 820958-27: (8*8)+(7*2)+(6*0)+(5*9)+(4*5)+(3*8)+(2*2)+(1*7)=178 178 % 10 = 8 So 820958-27-8 is a valid CAS Registry Number.
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2,3,3,3-tetrafluoro-2-[1,1,2,3,3,3-hexafluoro-2-(heptafluoropropoxy)prop
oxy]propyl ester