The CAS Registry Mumber 189278-41-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,9,2,7 and 8 respectively; the second part has 2 digits, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 189278-41: (8*1)+(7*8)+(6*9)+(5*2)+(4*7)+(3*8)+(2*4)+(1*1)=189 189 % 10 = 9 So 189278-41-9 is a valid CAS Registry Number.
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4-[2-(5-chloro-3-methyl-1-phenyl-1H-pyrazol-4-yl)ethenyl]-1-ethyl-,
iodide