The CAS Registry Mumber 77590-91-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,5,9 and 0 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 77590-91: (7*7)+(6*7)+(5*5)+(4*9)+(3*0)+(2*9)+(1*1)=171 171 % 10 = 1 So 77590-91-1 is a valid CAS Registry Number.
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