The CAS Registry Mumber 1569807-27-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,5,6,9,8,0 and 7 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 1569807-27: (9*1)+(8*5)+(7*6)+(6*9)+(5*8)+(4*0)+(3*7)+(2*2)+(1*7)=217 217 % 10 = 7 So 1569807-27-7 is a valid CAS Registry Number.
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