The CAS Registry Mumber 116394-89-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,6,3,9 and 4 respectively; the second part has 2 digits, 8 and 9 respectively. Calculate Digit Verification of CAS Registry Number 116394-89: (8*1)+(7*1)+(6*6)+(5*3)+(4*9)+(3*4)+(2*8)+(1*9)=139 139 % 10 = 9 So 116394-89-9 is a valid CAS Registry Number.
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2-amino-N-(3,4-dihydro-4-methyl-2-oxo-2H-1-benzopyran-7-yl)-