The CAS Registry Mumber 188560-12-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,8,5,6 and 0 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 188560-12: (8*1)+(7*8)+(6*8)+(5*5)+(4*6)+(3*0)+(2*1)+(1*2)=165 165 % 10 = 5 So 188560-12-5 is a valid CAS Registry Number.
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