The CAS Registry Mumber 121551-80-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,1,5,5 and 1 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 121551-80: (8*1)+(7*2)+(6*1)+(5*5)+(4*5)+(3*1)+(2*8)+(1*0)=92 92 % 10 = 2 So 121551-80-2 is a valid CAS Registry Number.
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22-[[3-(4-hydroxy-3-methoxyphenyl)-1-oxo-2-propenyl]oxy]-,
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