The CAS Registry Mumber 118590-37-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,8,5,9 and 0 respectively; the second part has 2 digits, 3 and 7 respectively. Calculate Digit Verification of CAS Registry Number 118590-37: (8*1)+(7*1)+(6*8)+(5*5)+(4*9)+(3*0)+(2*3)+(1*7)=137 137 % 10 = 7 So 118590-37-7 is a valid CAS Registry Number.
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2-[[[butyl[(6-diazo-5,6-dihydro-5-oxo-1-naphthalenyl)sulfonyl]amino]carb
onyl]oxy]ethyl ester