The CAS Registry Mumber 87765-81-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,7,6 and 5 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 87765-81: (7*8)+(6*7)+(5*7)+(4*6)+(3*5)+(2*8)+(1*1)=189 189 % 10 = 9 So 87765-81-9 is a valid CAS Registry Number.
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