The CAS Registry Mumber 556016-30-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,5,6,0,1 and 6 respectively; the second part has 2 digits, 3 and 0 respectively. Calculate Digit Verification of CAS Registry Number 556016-30: (8*5)+(7*5)+(6*6)+(5*0)+(4*1)+(3*6)+(2*3)+(1*0)=139 139 % 10 = 9 So 556016-30-9 is a valid CAS Registry Number.
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