The CAS Registry Mumber 127656-72-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,7,6,5 and 6 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 127656-72: (8*1)+(7*2)+(6*7)+(5*6)+(4*5)+(3*6)+(2*7)+(1*2)=148 148 % 10 = 8 So 127656-72-8 is a valid CAS Registry Number.
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