The CAS Registry Mumber 26587-20-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,6,5,8 and 7 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 26587-20: (7*2)+(6*6)+(5*5)+(4*8)+(3*7)+(2*2)+(1*0)=132 132 % 10 = 2 So 26587-20-2 is a valid CAS Registry Number.
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