The CAS Registry Mumber 113742-82-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,3,7,4 and 2 respectively; the second part has 2 digits, 8 and 2 respectively. Calculate Digit Verification of CAS Registry Number 113742-82: (8*1)+(7*1)+(6*3)+(5*7)+(4*4)+(3*2)+(2*8)+(1*2)=108 108 % 10 = 8 So 113742-82-8 is a valid CAS Registry Number.
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5-[(4-chlorophenyl)methylene]tetrahydro-6-hydroxy-2-oxo-, methyl ester