The CAS Registry Mumber 220630-04-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,0,6,3 and 0 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 220630-04: (8*2)+(7*2)+(6*0)+(5*6)+(4*3)+(3*0)+(2*0)+(1*4)=76 76 % 10 = 6 So 220630-04-6 is a valid CAS Registry Number.
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