The CAS Registry Mumber 61794-68-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,1,7,9 and 4 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 61794-68: (7*6)+(6*1)+(5*7)+(4*9)+(3*4)+(2*6)+(1*8)=151 151 % 10 = 1 So 61794-68-1 is a valid CAS Registry Number.
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1-[3'-(1-hydroxy-2,3,4,5-tetraphenyl-2,4-cyclopentadien-1-yl)[1,1'-biphen
yl]-4-yl]-2,3,4,5-tetraphenyl-